US20090276918A1 - Plants having enhanced yield-related traits and a method for making the same - Google Patents
Plants having enhanced yield-related traits and a method for making the same Download PDFInfo
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- US20090276918A1 US20090276918A1 US12/304,581 US30458107A US2009276918A1 US 20090276918 A1 US20090276918 A1 US 20090276918A1 US 30458107 A US30458107 A US 30458107A US 2009276918 A1 US2009276918 A1 US 2009276918A1
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- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
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- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/415—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
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Definitions
- the present invention relates generally to the field of molecular biology and concerns a method for enhancing various economically important yield-related traits in plants. More specifically, the present invention concerns methods for enhancing yield-related traits in plants by modulating expression in a plant of a nucleic acid encoding a particular type of NAC transcription factor. The present invention also concerns plants having modulated expression of a nucleic acid encoding a NAC transcription factor, which plants have enhanced yield-related traits relative to control plants.
- the present invention concerns a method for enhancing yield-related traits in plants by modulating expression in a plant of a nucleic acid encoding a Apetala 2-2 (AP2-2) polypeptide.
- the present invention also concerns plants having modulated expression of a nucleic acid encoding an AP2-2 polypeptide, which plants have enhanced yield-related traits relative to control plants.
- the present invention also concerns a method for enhancing yield-related traits in plants by modulating expression in a plant of a nucleic acid encoding an APETALA2-70-like (AP2-70-like) polypeptide.
- the present invention also concerns plants having modulated expression of a nucleic acid encoding an AP2-70-like polypeptide, which plants have enhanced yield-related traits relative to control plants.
- the invention also provides hitherto unknown AP2-70-like-encoding nucleic acids, and constructs comprising the same, useful in performing the methods of the invention.
- the invention also provides constructs useful in the methods of the invention.
- Yield is normally defined as the measurable produce of economic value from a crop. This may be defined in terms of quantity and/or quality. Yield is directly dependent on several factors, for example, the number and size of the organs, plant architecture (for example, the number of branches), seed production, leaf senescence and more. Root development, nutrient uptake, stress tolerance and early vigour may also be important factors in determining yield. Optimizing the abovementioned factors may therefore contribute to increasing crop yield.
- Seed yield is a particularly important trait, since the seeds of many plants are important for human and animal nutrition.
- Crops such as, corn, rice, wheat, canola and soybean account for over half the total human caloric intake, whether through direct consumption of the seeds themselves or through consumption of meat products raised on processed seeds. They are also a source of sugars, oils and many kinds of metabolites used in industrial processes. Seeds contain an embryo (the source of new shoots and roots) and an endosperm (the source of nutrients for embryo growth during germination and during early growth of seedlings).
- the development of a seed involves many genes, and requires the transfer of metabolites from the roots, leaves and stems into the growing seed.
- the endosperm in particular, assimilates the metabolic precursors of carbohydrates, oils and proteins and synthesizes them into storage macromolecules to fill out the grain.
- a further trait of economic importance for many crops is early vigour. Improving early vigour is an important objective of modern rice breeding programs in both temperate and tropical rice cultivars. Long roots are important for proper soil anchorage in water-seeded rice. Where rice is sown directly into flooded fields, and where plants must emerge rapidly through water, longer shoots are associated with vigour. Where drill-seeding is practiced, longer mesocotyls and coleoptiles are important for good seedling emergence. Early vigour may also result from increased plant fitness due to, for example, the plants being better adapted to their environment (i.e. being more able to cope with various abiotic or biotic stress factors). Plants having early vigour also show better establishment of the crop (with the crop growing in a more uniform manner, i.e. with the majority of plants reaching the various stages of development at substantially the same time), and show better growth and often better yield.
- a further important trait is improved abiotic stress tolerance.
- Abiotic stress is a primary cause of crop loss worldwide, reducing average yields for most major crop plants by more than 50% (Wang et al., Planta (2003) 218: 1-14).
- Abiotic stresses may be caused by drought, salinity, extremes of temperature, chemical toxicity and oxidative stress.
- the ability to improve plant tolerance to abiotic stress would be of great economic advantage to farmers worldwide and would allow for the cultivation of crops during adverse conditions and in territories where cultivation of crops may not otherwise be possible.
- Transcription factors are usually defined as proteins that show sequence-specific DNA binding and that are capable of activating and/or repressing transcription.
- the Arabidopsis genome codes for at least 1533 transcriptional regulators, which account for ⁇ 5.9% of its estimated total number of genes. About 45% of these transcription factors are reported to be from families specific to plants (Riechmann et al., 2000 (Science Vol. 290, 2105-2109)).
- the present invention concerns the use of a particular type of NAC transcription factor for enhancing yield-related traits in plants.
- NAC is an acronym derived from the names of the three genes first described as containing a NAC domain, namely NAM (no apical meristem), ATAF1,2 and CUC2 (cup-shaped cotyledon). NAC proteins appear to be widespread in plants, with the genome of Arabidopsis thaliana estimated to contain at least a hundred NAC-encoding genes, but without any examples having been found to date in other eukaryotes (Riechmann et al., 2000).
- the NAC protein family comprises a variety of plant proteins that are identifiable by the presence of a highly conserved N-terminal NAC domain, accompanied by diverse C-terminal domains.
- the DNA-binding ability of NAC proteins is generally localized to the NAC domain, with the C-terminal regions constituting transcriptional activation domains.
- Several NAC genes have been found to be hormone inducible. NAC domains have also been implicated in interactions with other proteins, such as viral proteins and RING finger proteins.
- NAC proteins have also been implicated in transcriptional control in a variety of plant processes, including in the development of the shoot apical meristem and floral organs, and in the formation of lateral roots. NAC proteins have also been implicated in responses to stress and viral infections, Ernst et al., 2004 (EMBO Reports 5, 3, 297-303).
- U.S. Pat. No. 6,844,486 describes a member of the NAC family, NACI, isolated from Arabidopsis thaliana .
- NACI was reported to be involved in the regulation of cotyledon and lateral root development.
- Overexpression of the nacI gene was reported to give larger plants with larger roots and more lateral roots than wild-type plants.
- the present invention provides a method for enhancing yield-related traits in plants relative to control plants, comprising modulating expression in a plant of a nucleic acid encoding a particular type of NAC transcription factor.
- the present invention concerns the use of an Apetala type transcription factor, AP2-2, for enhancing yield-related traits in plants.
- AP2 APETALA2
- EREBPs ethylene-responsive element binding proteins, or ERF, ethylene response factors
- AP2/EREBP genes form a large multigene family (the AP2/ERF superfamily), and they play a variety of roles throughout the plant life cycle: from being key regulators of several developmental processes, like floral organ identity determination or control of leaf epidermal cell identity, to forming part of the mechanisms used by plants to respond to various types of biotic and environmental stress.
- AP2/ERF Within the AP2/ERF superfamily, 3 large families are discriminated: the AP2 family with two AP2/ERF domains, the ERF family with a single AP2/ERF domain and the RAV family comprising a B3-type DNA binding domain.
- Nakano et al. (Plant Physiology 140, 411-432, 2006) studied the ERF gene family in Arabidopsis and rice, and divided the Arabidopsis ERF gene family into 12 groups (designated Group I to X, and a Group VI-like and Group Xb-like), whereas in the case of rice 15 groups were discriminated.
- the Arabidopsis Group VII proteins are characterised by a conserved N-terminal motif, referred to as conserveed Motif VII-1 (CMVII-1).
- Group VII comprises more proteins than the Arabidopsis Group VII, and though many conserved motifs are in common between the rice and Arabidopsis Group VII, a separate rice Group VIIb was created for a sequence lacking this typical CMVII-1 motif.
- members of Group VII are described to be involved in osmotic stress and disease responses (for example in WO 2003007699).
- Ectopic overexpression of tomato JERF3 in tobacco increased the salt tolerance of the transgenics (Wang et al., Plant Molecular Biology 58, 183-192, 2004), and pepper transcription factor CaPF1 overexpression resulted in increased osmotic tolerance in pine (Tang et al, Plant Cell Rep. 26, 115-124, 2007), but also increased pathogen resistance in Arabidopsis (Yi et al., Plant Physiol. 136, 2862-2874, 2004).
- barley HvRAF Jung et al., Planta Epub 26 Aug. 2006.
- a Group VII type ERF protein was used in a process for the production of Methionine (EP2005003297).
- the ERF (Ethylene Response Factor) family is a large gene family of transcription factors and is part of the AP2/ERF superfamily, which also contains the AP2 and RAV families.
- the AP2/ERF superfamily is defined by the AP2/ERF domain, which consists of about 60 to 70 amino acids and is involved in DNA binding. These three families have been defined as follows.
- the AP2 family of proteins contain two repeated AP2/ERF domains, the ERF family of proteins contain a single AP2/ERF domain, and the RAV family proteins contain a B3 domain, which is a DNA-binding domain conserved in other plant-specific transcription factors, including VP1/ABI3, in addition to the single AP2/ERF domain.
- the ERF family is sometimes further divided into two major subfamilies, the ERF subfamily and the CBF/DREB subfamily. 147 genes have been identified in the AP2/ERF superfamily in the Arabidopsis genome, including 122 genes in the ERF family.
- the AP2 domain was first identified as a repeated motif within the Arabidopsis ( Arabidopsis thaliana ) AP2 protein, which is involved in flower development. Nakano et al., 2006 (Plant Physiol. Vol. 140, pp. 411-432).
- AP2-70-like polypeptides described herein as being useful in enhancing yield-related traits in plants are classified in Group Ib (A-6) according to the classification system of Nakano et al., 2006. Nakano reports that DBF1 from maize ( Zea mays )—a member of Group Ib—has been shown to activate the drought-responsive element 2 (DRE2)-dependent transcription of ABA-responsive rab17 in transiently transformed maize callus. In another Group Ib member, Medicago truncatula WXP1, overexpression of the same was reported to activate wax production in transgenic alfalfa ( Medicago sativa ).
- DRE2 drought-responsive element 2
- polypeptide and “protein” are used interchangeably herein and refer to amino acids in a polymeric form of any length, linked together by peptide bonds.
- nucleic acid sequence(s) refers to nucleotides, either ribonucleotides or deoxyribonucleotides or a combination of both, in a polymeric unbranched form of any length.
- control plants are routine part of an experimental setup and may include corresponding wild type plants or corresponding plants without the gene of interest.
- the control plant is typically of the same plant species or even of the same variety as the plant to be assessed.
- the control plant may also be a nullizygote of the plant to be assessed. Nullizygotes are individuals missing the transgene by segregation.
- a “control plant” as used herein refers not only to whole plants, but also to plant parts, including seeds and seed parts.
- “Homologues” of a protein encompass peptides, oligopeptides, polypeptides, proteins and enzymes having amino acid substitutions, deletions and/or insertions relative to the unmodified protein in question and having similar biological and functional activity as the unmodified protein from which they are derived.
- a deletion refers to removal of one or more amino acids from a protein.
- Insertions refers to one or more amino acid residues being introduced into a predetermined site in a protein. Insertions may comprise N-terminal and/or C-terminal fusions as well as intra-sequence insertions of single or multiple amino acids. Generally, insertions within the amino acid sequence will be smaller than N- or C-terminal fusions, of the order of about 1 to 10 residues.
- a substitution refers to replacement of amino acids of the protein with other amino acids having similar properties (such as similar hydrophobicity, hydrophilicity, antigenicity, propensity to form or break ⁇ -helical structures or ⁇ -sheet structures).
- Amino acid substitutions are typically of single residues, but may be clustered depending upon functional constraints placed upon the polypeptide; insertions will usually be of the order of about 1 to 10 amino acid residues.
- the amino acid substitutions are preferably conservative amino acid substitutions. Conservative substitution tables are well known in the art (see for example Creighton (1984) Proteins. W.H. Freeman and Company (Eds) and Table 1 below).
- Amino acid substitutions, deletions and/or insertions may readily be made using peptide synthetic techniques well known in the art, such as solid phase peptide synthesis and the like, or by recombinant DNA manipulation. Methods for the manipulation of DNA sequences to produce substitution, insertion or deletion variants of a protein are well known in the art. For example, techniques for making substitution mutations at predetermined sites in DNA are well known to those skilled in the art and include M13 mutagenesis, T7-Gen in vitro mutagenesis (USB, Cleveland, Ohio), QuickChange Site Directed mutagenesis (Stratagene, San Diego, Calif.), PCR-mediated site-directed mutagenesis or other site-directed mutagenesis protocols.
- “Derivatives” include peptides, oligopeptides, polypeptides which may, compared to the amino acid sequence of the naturally-occurring form of the protein, such as the protein of interest, comprise substitutions of amino acids with non-naturally occurring amino acid residues, or additions of non-naturally occurring amino acid residues. “Derivatives” of a protein also encompass peptides, oligopeptides, polypeptides which comprise naturally occurring altered (glycosylated, acylated, prenylated, phosphorylated, myristoylated, sulphated etc.) or non-naturally altered amino acid residues compared to the amino acid sequence of a naturally-occurring form of the polypeptide.
- a derivative may also comprise one or more non-amino acid substituents or additions compared to the amino acid sequence from which it is derived, for example a reporter molecule or other ligand, covalently or non-covalently bound to the amino acid sequence, such as a reporter molecule which is bound to facilitate its detection, and non-naturally occurring amino acid residues relative to the amino acid sequence of a naturally-occurring protein.
- “derivatives” also include fusions of the naturally-occurring form of the protein with tagging peptides such as FLAG, HIS6 or thioredoxin (for a review of tagging peptides, see Terpe, Appl. Microbiol. Biotechnol. 60, 523-533, 2003).
- Orthologues and paralogues encompass evolutionary concepts used to describe the ancestral relationships of genes. Paralogues are genes within the same species that have originated through duplication of an ancestral gene; orthologues are genes from different organisms that have originated through speciation, and are also derived from a common ancestral gene.
- domain refers to a set of amino acids conserved at specific positions along an alignment of sequences of evolutionarily related proteins. While amino acids at other positions can vary between homologues, amino acids that are highly conserved at specific positions indicate amino acids that are likely essential in the structure, stability or function of a protein. Identified by their high degree of conservation in aligned sequences of a family of protein homologues, they can be used as identifiers to determine if any polypeptide in question belongs to a previously identified polypeptide family.
- motif or “consensus sequence” or “signature” refers to a short conserved region in the sequence of evolutionarily related proteins. Motifs are frequently highly conserved parts of domains, but may also include only part of the domain, or be located outside of conserved domain (if all of the amino acids of the motif fall outside of a defined domain).
- hybridisation is a process wherein substantially homologous complementary nucleotide sequences anneal to each other.
- the hybridisation process can occur entirely in solution, i.e. both complementary nucleic acids are in solution.
- the hybridisation process can also occur with one of the complementary nucleic acids immobilised to a matrix such as magnetic beads, Sepharose beads or any other resin.
- the hybridisation process can furthermore occur with one of the complementary nucleic acids immobilised to a solid support such as a nitro-cellulose or nylon membrane or immobilised by e.g. photolithography to, for example, a siliceous glass support (the latter known as nucleic acid arrays or microarrays or as nucleic acid chips).
- the nucleic acid molecules are generally thermally or chemically denatured to melt a double strand into two single strands and/or to remove hairpins or other secondary structures from single stranded nucleic acids.
- the T m is the temperature under defined ionic strength and pH, at which 50% of the target sequence hybridises to a perfectly matched probe.
- the T m is dependent upon the solution conditions and the base composition and length of the probe. For example, longer sequences hybridise specifically at higher temperatures.
- the maximum rate of hybridisation is obtained from about 16° C. up to 32° C. below T m .
- the presence of monovalent cations in the hybridisation solution reduce the electrostatic repulsion between the two nucleic acid strands thereby promoting hybrid formation; this effect is visible for sodium concentrations of up to 0.4M (for higher concentrations, this effect may be ignored).
- Formamide reduces the melting temperature of DNA-DNA and DNA-RNA duplexes with 0.6 to 0.7° C.
- T m may be calculated using the following equations, depending on the types of hybrids:
- Non-specific binding may be controlled using any one of a number of known techniques such as, for example, blocking the membrane with protein containing solutions, additions of heterologous RNA, DNA, and SDS to the hybridisation buffer, and treatment with Rnase.
- a series of hybridizations may be performed by varying one of (i) progressively lowering the annealing temperature (for example from 68° C. to 42° C.) or (ii) progressively lowering the formamide concentration (for example from 50% to 0%).
- annealing temperature for example from 68° C. to 42° C.
- formamide concentration for example from 50% to 0%
- hybridisation typically also depends on the function of post-hybridisation washes.
- samples are washed with dilute salt solutions.
- Critical factors of such washes include the ionic strength and temperature of the final wash solution: the lower the salt concentration and the higher the wash temperature, the higher the stringency of the wash.
- Wash conditions are typically performed at or below hybridisation stringency. A positive hybridisation gives a signal that is at least twice of that of the background.
- suitable stringent conditions for nucleic acid hybridisation assays or gene amplification detection procedures are as set forth above. More or less stringent conditions may also be selected. The skilled artisan is aware of various parameters which may be altered during washing and which will either maintain or change the stringency conditions.
- typical high stringency hybridisation conditions for DNA hybrids longer than 50 nucleotides encompass hybridisation at 65° C. in 1 ⁇ SSC or at 42° C. in 1 ⁇ SSC and 50% formamide, followed by washing at 65° C. in 0.3 ⁇ SSC.
- Examples of medium stringency hybridisation conditions for DNA hybrids longer than 50 nucleotides encompass hybridisation at 50° C. in 4 ⁇ SSC or at 40° C. in 6 ⁇ SSC and 50% formamide, followed by washing at 50° C. in 2 ⁇ SSC.
- the length of the hybrid is the anticipated length for the hybridising nucleic acid. When nucleic acids of known sequence are hybridised, the hybrid length may be determined by aligning the sequences and identifying the conserved regions described herein.
- 1 ⁇ SSC is 0.15M NaCl and 15 mM sodium citrate; the hybridisation solution and wash solutions may additionally include 5 ⁇ Denhardt's reagent, 0.5-1.0% SDS, 100 ⁇ g/ml denatured, fragmented salmon sperm DNA, 0.5% sodium pyrophosphate.
- splice variant encompasses variants of a nucleic acid sequence in which selected introns and/or exons have been excised, replaced, displaced or added, or in which introns have been shortened or lengthened. Such variants will be ones in which the biological activity of the protein is substantially retained; this may be achieved by selectively retaining functional segments of the protein. Such splice variants may be found in nature or may be manmade. Methods for predicting and isolating such splice variants are well known in the art (see for example Foissac and Schiex (2005) BMC Bioinformatics 6: 25).
- Alleles or allelic variants are alternative forms of a given gene, located at the same chromosomal position. Allelic variants encompass Single Nucleotide Polymorphisms (SNPs), as well as Small Insertion/Deletion Polymorphisms (INDELs). The size of INDELs is usually less than 100 bp. SNPs and INDELs form the largest set of sequence variants in naturally occurring polymorphic strains of most organisms.
- Gene shuffling or directed evolution consists of iterations of DNA shuffling followed by appropriate screening and/or selection to generate variants of nucleic acids or portions thereof encoding proteins having a modified biological activity (Castle et al., (2004) Science 304(5674): 1151-4; U.S. Pat. Nos. 5,811,238 and 6,395,547).
- regulatory element control sequence
- promoter typically refers to a nucleic acid control sequence located upstream from the transcriptional start of a gene and which is involved in recognising and binding of RNA polymerase and other proteins, thereby directing transcription of an operably linked nucleic acid.
- transcriptional regulatory sequences derived from a classical eukaryotic genomic gene (including the TATA box which is required for accurate transcription initiation, with or without a CCAAT box sequence) and additional regulatory elements (i.e. upstream activating sequences, enhancers and silencers) which alter gene expression in response to developmental and/or external stimuli, or in a tissue-specific manner.
- additional regulatory elements i.e. upstream activating sequences, enhancers and silencers
- a transcriptional regulatory sequence of a classical prokaryotic gene in which case it may include a ⁇ 35 box sequence and/or ⁇ 10 box transcriptional regulatory sequences.
- regulatory element also encompasses a synthetic fusion molecule or derivative that confers, activates or enhances expression of a nucleic acid molecule in a cell, tissue or organ.
- a “plant promoter” comprises regulatory elements, which mediate the expression of a coding sequence segment in plant cells. Accordingly, a plant promoter need not be of plant origin, but may originate from viruses or micro-organisms, for example from viruses which attack plant cells. The “plant promoter” can also originate from a plant cell, e.g. from the plant which is transformed with the nucleic acid sequence to be expressed in the inventive process and described herein. This also applies to other “plant” regulatory signals, such as “plant” terminators.
- the promoters upstream of the nucleotide sequences useful in the methods of the present invention can be modified by one or more nucleotide substitution(s), insertion(s) and/or deletion(s) without interfering with the functionality or activity of either the promoters, the open reading frame (ORF) or the 3′-regulatory region such as terminators or other 3′ regulatory regions which are located away from the ORF. It is furthermore possible that the activity of the promoters is increased by modification of their sequence, or that they are replaced completely by more active promoters, even promoters from heterologous organisms.
- the nucleic acid molecule must, as described above, be linked operably to or comprise a suitable promoter which expresses the gene at the right point in time and with the required spatial expression pattern.
- the promoter strength and/or expression pattern of a candidate promoter may be analysed for example by operably linking the promoter to a reporter gene and assaying the expression level and pattern of the reporter gene in various tissues of the plant.
- Suitable well-known reporter genes include for example beta-glucuronidase or beta-galactosidase.
- the promoter activity is assayed by measuring the enzymatic activity of the beta-glucuronidase or beta-galactosidase.
- the promoter strength and/or expression pattern may then be compared to that of a reference promoter (such as the one used in the methods of the present invention).
- promoter strength may be assayed by quantifying mRNA levels or by comparing mRNA levels of the nucleic acid used in the methods of the present invention, with mRNA levels of housekeeping genes such as 18S rRNA, using methods known in the art, such as Northern blotting with densitometric analysis of autoradiograms, quantitative real-time PCR or RT-PCR (Heid et al., 1996 Genome Methods 6: 986-994).
- weak promoter is intended a promoter that drives expression of a coding sequence at a low level.
- low level is intended at levels of about 1/10,000 transcripts to about 1/100,000 transcripts, to about 1/500,0000 transcripts per cell.
- a “strong promoter” drives expression of a coding sequence at high level, or at about 1/10 transcripts to about 1/100 transcripts to about 1/1000 transcripts per cell.
- operably linked refers to a functional linkage between the promoter sequence and the gene of interest, such that the promoter sequence is able to initiate transcription of the gene of interest.
- a “constitutive promoter” refers to a promoter that is transcriptionally active during most, but not necessarily all, phases of growth and development and under most environmental conditions, in at least one cell, tissue or organ. Table 2a below gives examples of constitutive promoters.
- a ubiquitous promoter is active in substantially all tissues or cells of an organism.
- a developmentally-regulated promoter is active during certain developmental stages or in parts of the plant that undergo developmental changes.
- An inducible promoter has induced or increased transcription initiation in response to a chemical (for a review see Gatz 1997, Annu. Rev. Plant Physiol. Plant Mol. Biol., 48:89-108), environmental or physical stimulus, or may be “stress-inducible”, i.e. activated when a plant is exposed to various stress conditions, or a “pathogen-inducible” i.e. activated when a plant is exposed to exposure to various pathogens.
- organ-specific or tissue-specific promoter is one that is capable of preferentially initiating transcription in certain organs or tissues, such as the leaves, roots, seed tissue etc.
- a “root-specific promoter” is a promoter that is transcriptionally active predominantly in plant roots, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts. Promoters able to initiate transcription in certain cells only are referred to herein as “cell-specific”.
- root-specific promoters examples are listed in Table 2b below:
- a seed-specific promoter is transcriptionally active predominantly in seed tissue, but not necessarily exclusively in seed tissue (in cases of leaky expression).
- the seed-specific promoter may be active during seed development and/or during germination.
- a green tissue-specific promoter as defined herein is a promoter that is transcriptionally active predominantly in green tissue, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts.
- green tissue-specific promoters which may be used to perform the methods of the invention are shown in Table 2c below.
- tissue-specific promoter is a meristem-specific promoter, which is transcriptionally active predominantly in meristematic tissue, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts.
- terminal encompasses a control sequence which is a DNA sequence at the end of a transcriptional unit which signals 3′ processing and polyadenylation of a primary transcript and termination of transcription.
- the terminator can be derived from the natural gene, from a variety of other plant genes, or from T-DNA.
- the terminator to be added may be derived from, for example, the nopaline synthase or octopine synthase genes, or alternatively from another plant gene, or less preferably from any other eukaryotic gene.
- modulation means in relation to expression or gene expression, a process in which the expression level is changed by said gene expression in comparison to the control plant, preferably the expression level is increased.
- the original, unmodulated expression may be of any kind of expression of a structural RNA (rRNA, tRNA) or mRNA with subsequent translation.
- modulating the activity shall mean any change of the expression of the inventive nucleic acid sequences or encoded proteins, which leads to increased yield and/or increased growth of the plants.
- expression means the transcription of a specific gene or specific genes or specific genetic construct.
- expression in particular means the transcription of a gene or genes or genetic construct into structural RNA (rRNA, tRNA) or mRNA with or without subsequent translation of the latter into a protein. The process includes transcription of DNA and processing of the resulting mRNA product.
- Isolated nucleic acids which serve as promoter or enhancer elements may be introduced in an appropriate position (typically upstream) of a non-heterologous form of a polynucleotide so as to upregulate expression of a nucleic acid encoding the polypeptide of interest.
- endogenous promoters may be altered in vivo by mutation, deletion, and/or substitution (see, Kmiec, U.S. Pat. No. 5,565,350; Zarling et al., WO9322443), or isolated promoters may be introduced into a plant cell in the proper orientation and distance from a gene of the present invention so as to control the expression of the gene.
- polypeptide expression it is generally desirable to include a polyadenylation region at the 3′-end of a polynucleotide coding region.
- the polyadenylation region can be derived from the natural gene, from a variety of other plant genes, or from T-DNA.
- the 3′ end sequence to be added may be derived from, for example, the nopaline synthase or octopine synthase genes, or alternatively from another plant gene, or less preferably from any other eukaryotic gene.
- An intron sequence may also be added to the 5′ untranslated region (UTR) or the coding sequence of the partial coding sequence to increase the amount of the mature message that accumulates in the cytosol.
- UTR 5′ untranslated region
- coding sequence of the partial coding sequence to increase the amount of the mature message that accumulates in the cytosol.
- Inclusion of a spliceable intron in the transcription unit in both plant and animal expression constructs has been shown to increase gene expression at both the mRNA and protein levels up to 1000-fold (Buchman and Berg (1988) Mol. Cell biol. 8: 4395-4405; Callis et al. (1987) Genes Dev 1:1183-1200).
- Such intron enhancement of gene expression is typically greatest when placed near the 5′ end of the transcription unit.
- Use of the maize introns Adh1-S intron 1, 2, and 6, the Bronze-1 intron are known in the art. For general information see: The Maize Handbook, Chapter 116, Freeling and Walbot, Eds.
- one or more terminator sequences may be used in the construct introduced into a plant.
- Additional regulatory elements may include transcriptional as well as translational enhancers.
- Other control sequences (besides promoter, enhancer, silencer, intron sequences, 3′UTR and/or 5′UTR regions) may be protein and/or RNA stabilizing elements. Such sequences would be known or may readily be obtained by a person skilled in the art.
- the genetic constructs of the invention may further include an origin of replication sequence that is required for maintenance and/or replication in a specific cell type.
- an origin of replication sequence that is required for maintenance and/or replication in a specific cell type.
- Preferred origins of replication include, but are not limited to, the f1-ori and colE1.
- an “endogenous” gene not only refers to the gene in question as found in a plant in its natural form (i.e., without there being any human intervention), but also refers to that same gene (or a substantially homologous nucleic acid/gene) in an isolated form subsequently (re)introduced into a plant (a transgene).
- a transgenic plant containing such a transgene may encounter a substantial reduction of the transgene expression and/or substantial reduction of expression of the endogenous gene.
- the isolated gene may be isolated from an organism or may be manmade, for example by chemical synthesis.
- Reference herein to “decreased expression” or “reduction or substantial elimination” of expression is taken to mean a decrease in endogenous gene expression and/or polypeptide levels and/or polypeptide activity relative to control plants.
- the reduction or substantial elimination is in increasing order of preference at least 10%, 20%, 30%, 40% or 50%, 60%, 70%, 80%, 85%, 90%, or 95%, 96%, 97%, 98%, 99% or more reduced compared to that of control plants.
- Reduction or substantial elimination of expression may be achieved using routine tools and techniques known in the art.
- “Selectable marker”, “selectable marker gene” or “reporter gene” includes any gene that confers a phenotype on a cell in which it is expressed to facilitate the identification and/or selection of cells that are transfected or transformed with a nucleic acid construct of the invention. These marker genes enable the identification of a successful transfer of the nucleic acid molecules via a series of different principles. Suitable markers may be selected from markers that confer antibiotic or herbicide resistance, that introduce a new metabolic trait or that allow visual selection.
- selectable marker genes include genes conferring resistance to antibiotics (such as nptII that phosphorylates neomycin and kanamycin, or hpt, phosphorylating hygromycin, or genes conferring resistance to, for example, bleomycin, streptomycin, tetracyclin, chloramphenicol, ampicillin, gentamycin, geneticin (G418), spectinomycin or blasticidin), to herbicides (for example bar which provides resistance to Basta®; aroA or gox providing resistance against glyphosate, or the genes conferring resistance to, for example, imidazolinone, phosphinothricin or sulfonylurea), or genes that provide a metabolic trait (such as manA that allows plants to use mannose as sole carbon source or xylose isomerase for the utilisation of xylose, or antinutritive markers such as the resistance to 2-deoxyglucose).
- antibiotics such as nptII that phospho
- Visual marker genes results in the formation of colour (for example ⁇ -glucuronidase, GUS or ⁇ -galactosidase with its coloured substrates, for example X-Gal), luminescence (such as the luciferin/luciferase system) or fluorescence (Green Fluorescent Protein, GFP, and derivatives thereof).
- colour for example ⁇ -glucuronidase, GUS or ⁇ -galactosidase with its coloured substrates, for example X-Gal
- luminescence such as the luciferin/luciferase system
- fluorescence Green Fluorescent Protein
- nucleic acid molecules encoding a selectable marker can be introduced into a host cell on the same vector that comprises the sequence encoding the polypeptides of the invention or used in the methods of the invention, or else in a separate vector. Cells which have been stably transfected with the introduced nucleic acid can be identified for example by selection (for example, cells which have integrated the selectable marker survive whereas the other cells die).
- the process according to the invention for introducing the nucleic acids advantageously employs techniques which enable the removal or excision of these marker genes.
- One such a method is what is known as co-transformation.
- the co-transformation method employs two vectors simultaneously for the transformation, one vector bearing the nucleic acid according to the invention and a second bearing the marker gene(s).
- a large proportion of transformants receives or, in the case of plants, comprises (up to 40% or more of the transformants), both vectors.
- the transformants usually receive only a part of the vector, i.e.
- the marker genes can subsequently be removed from the transformed plant by performing crosses.
- marker genes integrated into a transposon are used for the transformation together with desired nucleic acid (known as the Ac/Ds technology).
- the transformants can be crossed with a transposase source or the transformants are transformed with a nucleic acid construct conferring expression of a transposase, transiently or stable.
- the transposon jumps out of the genome of the host cell once transformation has taken place successfully and is lost.
- the transposon jumps to a different location. In these cases the marker gene must be eliminated by performing crosses.
- Cre/lox system Cre1 is a recombinase that removes the sequences located between the loxP sequences. If the marker gene is integrated between the loxP sequences, it is removed once transformation has taken place successfully, by expression of the recombinase.
- Cre1 is a recombinase that removes the sequences located between the loxP sequences. If the marker gene is integrated between the loxP sequences, it is removed once transformation has taken place successfully, by expression of the recombinase.
- Further recombination systems are the HIN/HIX, FLP/FRT and REP/STB system (Tribble et al., J. Biol.
- transgenic means with regard to, for example, a nucleic acid sequence, an expression cassette, gene construct or a vector comprising the nucleic acid sequence or an organism transformed with the nucleic acid sequences, expression cassettes or vectors according to the invention, all those constructions brought about by recombinant methods in which either
- nucleic acid sequences encoding proteins useful in the methods of the invention or (b) genetic control sequence(s) which is operably linked with the nucleic acid sequence according to the invention, for example a promoter, or (c) a) and b) are not located in their natural genetic environment or have been modified by recombinant methods, it being possible for the modification to take the form of, for example, a substitution, addition, deletion, inversion or insertion of one or more nucleotide residues.
- the natural genetic environment is understood as meaning the natural genomic or chromosomal locus in the original plant or the presence in a genomic library. In the case of a genomic library, the natural genetic environment of the nucleic acid sequence is preferably retained, at least in part.
- transgenic plant for the purposes of the invention is thus understood as meaning, as above, that the nucleic acids used in the method of the invention are not at their natural locus in the genome of said plant, it being possible for the nucleic acids to be expressed homologously or heterologously.
- transgenic also means that, while the nucleic acids according to the invention or used in the inventive method are at their natural position in the genome of a plant, the sequence has been modified with regard to the natural sequence, and/or that the regulatory sequences of the natural sequences have been modified.
- Transgenic is preferably understood as meaning the expression of the nucleic acids according to the invention at an unnatural locus in the genome, i.e. homologous or, preferably, heterologous expression of the nucleic acids takes place.
- Preferred transgenic plants are mentioned herein.
- tissue targets include leaf disks, pollen, embryos, cotyledons, hypocotyls, megagametophytes, callus tissue, existing meristematic tissue (e.g., apical meristem, axillary buds, and root meristems), and induced meristem tissue (e.g., cotyledon meristem and hypocotyl meristem).
- the polynucleotide may be transiently or stably introduced into a host cell and may be maintained non-integrated, for example, as a plasmid. Alternatively, it may be integrated into the host genome.
- the resulting transformed plant cell may then be used to regenerate a transformed plant in a manner known to persons skilled in the art.
- Transformation of plant species is now a fairly routine technique.
- any of several transformation methods may be used to introduce the gene of interest into a suitable ancestor cell.
- the methods described for the transformation and regeneration of plants from plant tissues or plant cells may be utilized for transient or for stable transformation. Transformation methods include the use of liposomes, electroporation, chemicals that increase free DNA uptake, injection of the DNA directly into the plant, particle gun bombardment, transformation using viruses or pollen and microprojection. Methods may be selected from the calcium/polyethylene glycol method for protoplasts (Krens, F. A. et al., (1982) Nature 296, 72-74; Negrutiu I et al.
- Transgenic plants including transgenic crop plants, are preferably produced via Agrobacterium -mediated transformation.
- An advantageous transformation method is the transformation in planta.
- agrobacteria to act on plant seeds or to inoculate the plant meristem with agrobacteria. It has proved particularly expedient in accordance with the invention to allow a suspension of transformed agrobacteria to act on the intact plant or at least on the flower primordia. The plant is subsequently grown on until the seeds of the treated plant are obtained (Clough and Bent, Plant J. (1998) 16, 735-743).
- Methods for Agrobacterium -mediated transformation of rice include well known methods for rice transformation, such as those described in any of the following: European patent application EP 1198985 A1, Aldemita and Hodges (Planta 199: 612-617, 1996); Chan et al.
- nucleic acids or the construct to be expressed is preferably cloned into a vector, which is suitable for transforming Agrobacterium tumefaciens , for example pBin19 (Bevan et al., Nucl. Acids Res. 12 (1984) 8711).
- Agrobacteria transformed by such a vector can then be used in known manner for the transformation of plants, such as plants used as a model, like Arabidopsis ( Arabidopsis thaliana is within the scope of the present invention not considered as a crop plant), or crop plants such as, by way of example, tobacco plants, for example by immersing bruised leaves or chopped leaves in an agrobacterial solution and then culturing them in suitable media.
- plants used as a model like Arabidopsis ( Arabidopsis thaliana is within the scope of the present invention not considered as a crop plant), or crop plants such as, by way of example, tobacco plants, for example by immersing bruised leaves or chopped leaves in an agrobacterial solution and then culturing them in suitable media.
- the transformation of plants by means of Agrobacterium tumefaciens is described, for example, by Höfgen and Willmitzer in Nucl. Acid Res. (1988) 16, 9877 or is known inter alia from F. F. White, Vector
- the transformation of the chloroplast genome is generally achieved by a process which has been schematically displayed in Klaus et al., 2004 [Nature Biotechnology 22 (2), 225-229]. Briefly the sequences to be transformed are cloned together with a selectable marker gene between flanking sequences homologous to the chloroplast genome. These homologous flanking sequences direct site specific integration into the plastome. Plastidal transformation has been described for many different plant species and an overview is given in Bock (2001) Transgenic plastids in basic research and plant biotechnology. J Mol Biol. 2001 Sep. 21; 312 (3):425-38 or Maliga, P (2003) Progress towards commercialization of plastid transformation technology. Trends Biotechnol. 21, 20-28. Further biotechnological progress has recently been reported in form of marker free plastid transformants, which can be produced by a transient co-integrated maker gene (Klaus et al., 2004, Nature Biotechnology 22(2), 225-229).
- T-DNA activation tagging involves insertion of T-DNA, usually containing a promoter (may also be a translation enhancer or an intron), in the genomic region of the gene of interest or 10 kb up- or downstream of the coding region of a gene in a configuration such that the promoter directs expression of the targeted gene.
- a promoter may also be a translation enhancer or an intron
- regulation of expression of the targeted gene by its natural promoter is disrupted and the gene falls under the control of the newly introduced promoter.
- the promoter is typically embedded in a T-DNA. This T-DNA is randomly inserted into the plant genome, for example, through Agrobacterium infection and leads to modified expression of genes near the inserted T-DNA.
- the resulting transgenic plants show dominant phenotypes due to modified expression of genes close to the introduced promoter.
- TILLING is an abbreviation of “Targeted Induced Local Lesions In Genomes” and refers to a mutagenesis technology useful to generate and/or identify nucleic acids encoding proteins with modified expression and/or activity. TILLING also allows selection of plants carrying such mutant variants. These mutant variants may exhibit modified expression, either in strength or in location or in timing (if the mutations affect the promoter for example). These mutant variants may exhibit higher activity than that exhibited by the gene in its natural form. TILLING combines high-density mutagenesis with high-throughput screening methods.
- Homologous recombination allows introduction in a genome of a selected nucleic acid at a defined selected position.
- Homologous recombination is a standard technology used routinely in biological sciences for lower organisms such as yeast or the moss Physcomitrella . Methods for performing homologous recombination in plants have been described not only for model plants (Offring a et al. (1990) EMBO J 9(10): 3077-84) but also for crop plants, for example rice (Terada et al. (2002) Nat Biotech 20(10): 1030-4; Iida and Terada (2004) Curr Opin Biotech 15(2): 132-8).
- yield in general means a measurable produce of economic value, typically related to a specified crop, to an area, and to a period of time. Individual plant parts directly contribute to yield based on their number, size and/or weight, or the actual yield is the yield per acre for a crop and year, which is determined by dividing total production (includes both harvested and appraised production) by planted acres.
- yield of a plant may relate to vegetative biomass (root and/or shoot biomass), to reproductive organs, and/or to propagules (such as seeds) of that plant.
- a yield increase may be manifested as one or more of the following: increase in the number of plants established per hectare or acre, an increase in the number of ears per plant, an increase in the number of rows, number of kernels per row, kernel weight, thousand kernel weight, ear length/diameter, increase in the seed filling rate (which is the number of filled seeds divided by the total number of seeds and multiplied by 100), among others.
- a yield increase may manifest itself as an increase in one or more of the following: number of plants per hectare or acre, number of panicles per plant, number of spikelets per panicle, number of flowers (florets) per panicle (which is expressed as a ratio of the number of filled seeds over the number of primary panicles), increase in the seed filling rate (which is the number of filled seeds divided by the total number of seeds and multiplied by 100), increase in thousand kernel weight, among others.
- “Early vigour” refers to active healthy well-balanced growth especially during early stages of plant growth, and may result from increased plant fitness due to, for example, the plants being better adapted to their environment (i.e. optimizing the use of energy resources and partitioning between shoot and root). Plants having early vigour also show increased seedling survival and a better establishment of the crop, which often results in highly uniform fields (with the crop growing in uniform manner, i.e. with the majority of plants reaching the various stages of development at substantially the same time), and often better and higher yield. Therefore, early vigour may be determined by measuring various factors, such as thousand kernel weight, percentage germination, percentage emergence, seedling growth, seedling height, root length, root and shoot biomass and many more.
- the “greenness index” as used herein is calculated from digital images of plants. For each pixel belonging to the plant object on the image, the ratio of the green value versus the red value (in the RGB model for encoding color) is calculated. The greenness index is expressed as the percentage of pixels for which the green-to-red ratio exceeds a given threshold. Under normal growth conditions, under salt stress growth conditions, and under reduced nutrient availability growth conditions, the greenness index of plants is measured in the last imaging before flowering. In contrast, under drought stress growth conditions, the greenness index of plants is measured in the first imaging after drought.
- Increased seed yield may manifest itself as one or more of the following: a) an increase in seed biomass (total seed weight) which may be on an individual seed basis and/or per plant and/or per hectare or acre; b) increased number of flowers per plant; c) increased number of (filled) seeds; d) increased seed filling rate (which is expressed as the ratio between the number of filled seeds divided by the total number of seeds; e) increased harvest index, which is expressed as a ratio of the yield of harvestable parts, such as seeds, divided by the total biomass; and f) increased thousand kernel weight (TKW), which is extrapolated from the number of filled seeds counted and their total weight.
- An increased TKW may result from an increased seed size and/or seed weight, and may also result from an increase in embryo and/or endosperm size.
- An increase in seed yield may also be manifested as an increase in seed size and/or seed volume. Furthermore, an increase in seed yield may also manifest itself as an increase in seed area and/or seed length and/or seed width and/or seed perimeter. Increased yield may also result in modified architecture, or may occur because of modified architecture.
- transgenic plants according to the present invention have increased yield, it is likely that these plants exhibit an increased growth rate (during at least part of their life cycle), relative to the growth rate of corresponding wild type plants at a corresponding stage in their life cycle. Besides the increased yield capacity, an increased efficiency of nutrient uptake may also contribute to the increase in yield. It is observed that the plants according to the present invention show a higher efficiency in nutrient uptake. Increased efficiency of nutrient uptake allows better growth of the plant, whether the plant is under stress or non-stress conditions.
- the increased growth rate may be specific to one or more parts of a plant (including seeds), or may be throughout substantially the whole plant.
- a plant having an increased growth rate may even exhibit early flowering.
- the increase in growth rate may take place at one or more stages in the life cycle of a plant or during substantially the whole plant life cycle. Increased growth rate during the early stages in the life cycle of a plant may reflect enhanced vigour (increased seedling vigor at emergence).
- the increase in growth rate may alter the harvest cycle of a plant allowing plants to be sown later and/or harvested sooner than would otherwise be possible.
- the growth rate is sufficiently increased, it may allow for the further sowing of seeds of the same plant species (for example sowing and harvesting of rice plants followed by sowing and harvesting of further rice plants all within one conventional growing period). Similarly, if the growth rate is sufficiently increased, it may allow for the further sowing of seeds of different plants species (for example the sowing and harvesting of rice plants followed by, for example, the sowing and optional harvesting of soy bean, potato or any other suitable plant). Harvesting additional times from the same rootstock in the case of some crop plants may also be possible. Altering the harvest cycle of a plant may lead to an increase in annual biomass production per acre (due to an increase in the number of times (say in a year) that any particular plant may be grown and harvested).
- An increase in growth rate may also allow for the cultivation of transgenic plants in a wider geographical area than their wild-type counterparts, since the territorial limitations for growing a crop are often determined by adverse environmental conditions either at the time of planting (early season) or at the time of harvesting (late season). Such adverse conditions may be avoided if the harvest cycle is shortened.
- the growth rate may be determined by deriving various parameters from growth curves, such parameters may be: T-Mid (the time taken for plants to reach 50% of their maximal size) and T-90 (time taken for plants to reach 90% of their maximal size), amongst others.
- Mild stress in the sense of the invention leads to a reduction in the growth of the stressed plants of less than 40%, 35% or 30%, preferably less than 25%, 20% or 15%, more preferably less than 14%, 13%, 12%, 11% or 10% or less in comparison to the control plant under non-stress conditions.
- Mild stresses are the everyday biotic and/or abiotic (environmental) stresses to which a plant is exposed.
- Abiotic stresses may be due to drought or excess water, anaerobic stress, salt stress, chemical toxicity, oxidative stress and hot, cold or freezing temperatures.
- the abiotic stress may be an osmotic stress caused by a water stress (particularly due to drought), salt stress, oxidative stress or an ionic stress.
- Biotic stresses are typically those stresses caused by pathogens, such as bacteria, viruses, fungi and insects.
- the methods of the present invention may be performed under non-stress conditions to give plants having increased yield relative to control plants.
- abiotic stress leads to a series of morphological, physiological, biochemical and molecular changes that adversely affect plant growth and productivity. Drought, salinity, extreme temperatures and oxidative stress are known to be interconnected and may induce growth and cellular damage through similar mechanisms. Rabbani et al. (Plant Physiol (2003) 133: 1755-1767) describes a particularly high degree of “cross talk” between drought stress and high-salinity stress.
- non-stress conditions are those environmental conditions that allow optimal growth of plants. Persons skilled in the art are aware of normal soil conditions and climatic conditions for a given location.
- plant as used herein encompasses whole plants, ancestors and progeny of the plants and plant parts, including seeds, shoots, stems, leaves, roots (including tubers), flowers, and tissues and organs, wherein each of the aforementioned comprise the gene/nucleic acid of interest.
- plant also encompasses plant cells, suspension cultures, callus tissue, embryos, meristematic regions, gametophytes, sporophytes, pollen and microspores, again wherein each of the aforementioned comprises the gene/nucleic acid of interest.
- Plants that are particularly useful in the methods of the invention include all plants which belong to the superfamily Viridiplantae, in particular monocotyledonous and dicotyledonous plants including fodder or forage legumes, ornamental plants, food crops, trees or shrubs selected from the list comprising Acacia spp., Acer spp., Actinidia spp., Aesculus spp., Agathis australis, Albizia amara, Alsophila tricolor, Andropogon spp., Arachis spp, Areca catechu, Astelia fragrans, Astragalus cicer, Abelmoschus spp., Agave sisalana, Agropyron spp., Agrostis stolonifera, Allium spp., Amaranthus spp., Ammophila arenaria, Ananas comosus, Annona spp., Apium graveolens, Artocarpus spp.,
- Avena sativa e.g. Avena sativa, Avena fatua, Avena byzantina, Avena fatua var. sativa, Avena hybrida
- Averrhoa carambola Baikiaea pluriuga Betula spp.
- Betula spp. Bruguiera gymnorrhiza, Burkea africana, Butea frondosa, Bambusa sp.
- Benincasa hispida, Bertholletia excelsea, Beta vulgaris, Brassica spp. e.g. Brassica napus, Brassica rapa ssp.
- Glycine max Soja hispida or Soja max
- Glycine javanica Gliricidia spp
- Gossypium hirsutum Grevillea spp.
- Guibourtia coleosperma Gossypium hirsutum
- Helianthus spp. e.g. Helianthus annuus
- Hemerocallis fulva Hedysarum spp.
- Hemarthia altissima Heteropogon contortus
- Hibiscus spp. Hordeum spp.
- Solanum tuberosum, Solanum integrifolium or Solanum lycopersicum e.g. Solanum tuberosum, Solanum integrifolium or Solanum lycopersicum
- Sorghum bicolor Spinacia spp., Sporobolus fimbriatus, Stiburus alopecuroides, Stylosanthos humilis, Syzygium spp., Tadehagi spp, Taxodium distichum, Themeda triandra, Trifolium spp., Triticum spp. (e.g. Solanum tuberosum, Solanum integrifolium or Solanum lycopersicum ), Sorghum bicolor, Spinacia spp., Sporobolus fimbriatus, Stiburus alopecuroides, Stylosanthos humilis, Syzygium spp., Tadehagi spp, Taxodium distichum, Themeda t
- GAP uses the algorithm of Needleman and Wunsch ((1970) J Mol Biol 48: 443-453) to find the global (over the whole the sequence) alignment of two sequences that maximizes the number of matches and minimizes the number of gaps.
- the BLAST algorithm (Altschul et al. (1990) J Mol Biol 215: 403-10) calculates percent sequence identity and performs a statistical analysis of the similarity between the two sequences.
- the software for performing BLAST analysis is publicly available through the National Centre for Biotechnology Information (NCBI).
- Homologues may readily be identified using, for example, the ClustalW multiple sequence alignment algorithm (version 1.83), with the default pairwise alignment parameters, and a scoring method in percentage. Global percentages of similarity and identity may also be determined using one of the methods available in the MatGAT software package (Campanella et al., BMC Bioinformatics. 2003 Jul. 10; 4:29. MatGAT: an application that generates similarity/identity matrices using protein or DNA sequences). Minor manual editing may be performed to optimise alignment between conserved motifs, as would be apparent to a person skilled in the art. Furthermore, instead of using full-length sequences for the identification of homologues, specific domains may also be used. The sequence identity values, which are indicated below in Example 3 as a percentage were determined over the entire nucleic acid or amino acid sequence, and/or over selected domains or conserved motif(s), using the programs mentioned above using the default parameters.
- Reciprocal blast search typically involves a first BLAST involving BLASTing a query sequence (for example using any of the sequences listed in Table 1, Table 2, Table 14 of Example 9 or Table 18 of Example 18) against any sequence database, such as the publicly available NCBI database.
- BLASTN or TBLASTX are generally used when starting from a nucleotide sequence
- BLASTP or TBLASTN using standard default values
- the BLAST results may optionally be filtered.
- the full-length sequences of either the filtered results or non-filtered results are then BLASTed back (second BLAST) against sequences from the organism from which the query sequence is derived (where the query sequence is any of SEQ ID NO: 1 or SEQ ID NO: 2, or SEQ ID NO: 50 to SEQ ID NO: 59, or SEQ ID NO: 131 or SEQ ID NO: 132 or SEQ ID NO: 257 or SEQ ID NO: 258, the second BLAST would therefore be against Oryza sativa sequences).
- the results of the first and second BLASTs are then compared.
- a paralogue is identified if a high-ranking hit from the first blast is from the same species as from which the query sequence is derived, a BLAST back then ideally results in the query sequence as highest hit; an orthologue is identified if a high-ranking hit in the first BLAST is not from the same species as from which the query sequence is derived, and preferably results upon BLAST back in the query sequence being among the highest hits.
- High-ranking hits are those having a low E-value.
- Computation of the E-value is well known in the art.
- comparisons are also scored by percentage identity. Percentage identity refers to the number of identical nucleotides (or amino acids) between the two compared nucleic acid (or polypeptide) sequences over a particular length. In the case of large families, ClustalW may be used, followed by a neighbour joining tree, to help visualize clustering of related genes and to identify orthologues and paralogues.
- nucleic acid amplification-based methods for genetic and physical mapping may be carried out using the nucleic acids. Examples include allele-specific amplification (Kazazian (1989) J. Lab. Clin. Med 11:95-96), polymorphism of PCR-amplified fragments (CAPS; Sheffield et al. (1993) Genomics 16:325-332), allele-specific ligation (Landegren et al. (1988) Science 241:1077-1080), nucleotide extension reactions (Sokolov (1990) Nucleic Acid Res. 18:3671), Radiation Hybrid Mapping (Walter et al. (1997) Nat. Genet.
- the present invention provides a method for enhancing yield-related traits in plants relative to control plants, comprising modulating expression in a plant of a nucleic acid encoding a NAC transcription factor.
- a preferred method for modulating (preferably, increasing) expression of a nucleic acid encoding a NAC transcription factor is by introducing and expressing in a plant a nucleic acid encoding a particular class of NAC transcription factor as further defined below.
- the present invention provides a method for enhancing yield-related traits in plants relative to control plants, comprising modulating expression in a plant of a nucleic acid encoding an AP2-2 polypeptide.
- the present invention further provides a method for enhancing yield-related traits in plants relative to control plants, comprising modulating expression in a plant of a nucleic acid encoding an AP2-70-like polypeptide.
- nucleic acid to be introduced into a plant is any nucleic acid encoding the type of NAC transcription factor which will now be described.
- a “NAC transcription factor” as defined herein refers to any amino acid sequence which when used in the construction of a NAC phylogenetic tree, such as the one depicted in FIG. 1 , tends to cluster with the group of NACs comprising an amino acid sequence represented by any one of SEQ ID NO: 2, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55, SEQ ID NO: 57 or SEQ ID NO: 59, rather than with any other NAC group.
- a person skilled in the art could readily determine whether any amino acid sequence in question falls within the definition of a “NAC transcription factor” using known techniques and software for the making of such a phylogenetic tree, such as a GCG, EBI or CLUSTAL package, using default parameters.
- the phylogenetic tree of FIG. 1 is taken from Ooka et al., 2003 (DNA Research 10, 239-247, 2003). The method for constructing such a phylogenetic tree is described in Ooka et al., 2003. In the phylogenetic tree of FIG.
- SEQ ID NO: 2 is found in the group third up from the bottom, labelled “OsNAC7” and SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55, SEQ ID NO: 57 and SEQ ID NO: 59 are found in the area starting from (and including) the group labelled on the right hand side of the page as “ONAC022” and ending with (and including) the group labelled on the right hand side of the page as “OsNAC3”.
- NAC transcription factor is one comprising any one or more of the Motifs described below.
- Motif I KIDLDIIQELD, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif 1.
- Motif I is preferably K/P/RIG I/S/M D/A/E/Q U/I/V D I/V/F I Q/V/R/K E/D U/I/V D.
- Motif II CKYGXGHGGDEQTEW, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif 11, where ‘X’ is taken to be any amino acid or a gap.
- Motif II is preferably C K/R Y/L/I G XXX G/Y/N D/E E Q/R T/N/S EW, where ‘X’ is any amino acid or a gap.
- Motif III GWVVCRAFQKP, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif III.
- Motif III is preferably GWVVCR A/V F X 1 K X 2 , where ‘X 1 ’ and ‘X 2 ’ may be any amino acid, preferably X 1 is Q/R/K, preferably X 2 is P/R/K.
- Motifs I to III are found in the NACs represented by SEQ ID NO: 2, and are also typically found in NACs clustering (in a phylogenetic tree of NACs) with the group of NACs comprising SEQ ID NO: 2-rather than with any other NAC group.
- Motif IV PVPIIA, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif IV.
- Motif IV is preferably A/P/S/N V/L/I/A P/S/D/V/Q V/I I A/T/G.
- Motif V NGSRPN, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif V.
- Motif V is preferably N G/S S/Q/A/V RP N/S.
- Motif VI CRLYNKK, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif VI.
- Motif VI is preferably C/Y R/K L/I Y/H/F N/K K K/N/C/S/T
- Motifs III to VI are typically found in NACs of SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55 SEQ ID NO: 57 and SEQ ID NO: 59 and in NACs clustering (in a phylogenetic tree) with the NACs represented by the aforementioned SEQ ID NOs rather than with any other NAC group.
- Motif VII NEWEKMQ, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif VII.
- Motif VII is preferably N E/Q/T WEK M/V Q/R/K
- Motif VIII is preferably WGE T/A RTPES E/D
- Motif IX VPKKESMDDA, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif IX.
- Motif IX is preferably V/L PK K/E E S/R/A/V M/V/A/Q/R D/E D/E/L A/G/D
- Motif X SYDDIQGMYS, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif X.
- Motif X is preferably S L/Y DD L/I Q G/S L/M/P G/Y S/N.
- Motif XI is preferably DS M/V/I P R/K L/I/A H T/A/S D/E SS C/G SE.
- Motif XI is typically found in NACs of SEQ ID NO: 53 and SEQ ID NO: 55 and in NACs clustering (in a phylogenetic tree) with the NACs represented by the aforementioned SEQ ID NOs rather than with any other NAC group.
- Each of motifs I to XI may comprise one or more conservative amino acid substitution at any position.
- NAC transcription factors as defined herein i.e. any amino acid sequence which when used in the construction of a NAC phylogenetic tree, such as the one depicted in FIG. 1 , tends to cluster with the group of NACs represented by any one of SEQ ID NO: 2, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55 SEQ ID NO: 57 and SEQ ID NO: 59 rather than with any other NAC group, are as given in Tables 3 and 4 below.
- NAC transcription factors that cluster (in a phylogenetic tree) with the NAC represented by any one of SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55 SEQ ID NO: 57 and SEQ ID NO: 59 rather than with any other NAC group
- SEQ ID NO: 50 SEQ ID NO: 51 XM_470088.1 NAC1 Oryza sativa (also known as CDS4035 in the alignment of FIG. 2)
- SEQ ID NO: 52 SEQ ID NO: 53 AB028185.1 NAC4 Oryza sativa BAA89800.1 (known as OsNAC6 in alignment of FIG.
- SEQ ID NO: 54 SEQ ID NO: 55 AB028184.1 NAC6 Oryza sativa BAA89799.1 (known as OsNAC5 in alignment of FIG. 2)
- SEQ ID NO: 56 SEQ ID NO: 57 AK107330.1 NAC7 Oryza sativa (known as ONAC24 in alignment of FIG. 2)
- SEQ ID NO: 58 SEQ ID NO: 59 AK069257.1 NAC3 Oryza sativa (known as CDS4034 in alignment of FIG.
- SEQ ID NO: 60 SEQ ID NO: 61 AY625683.1 NAC2-like Triticum aestivum AAU08786.1 TaNAC2 SEQ ID NO: 62 SEQ ID NO: 63 AY103772.1 PCO133091 Zea mays SEQ ID NO: 64 SEQ ID NO: 65 AJ010829.1 GRAB1 Triticum aestivum CAA09371.1 TACAA09371.1 SEQ ID NO: 66 SEQ ID NO: 67 NM_186659.2 NAC3-like Oryza sativa NP_911548.1 RiceNP_911548.1 SEQ ID NO: 68 SEQ ID NO: 69 DQ267442.1 NAC1-like Elaeis guineensis ABB72844.1 elaeis SEQ ID NO: 70 SEQ ID NO: 71 AB028183.1 NAC4-like Oryza sativa BAA89798.1 OsNAC4 SEQ ID NO: 72 SEQ ID NO: 73
- the invention is illustrated by transforming plants with the Oryza sativa sequence represented by SEQ ID NO: 1, encoding the polypeptide sequence of SEQ ID NO: 2, and with the Oryza sativa sequence represented by SEQ ID NO: 50, encoding the polypeptide sequence of SEQ ID NO: 51, and with the Oryza sativa sequence represented by SEQ ID NO: 52, encoding the polypeptide sequence of SEQ ID NO: 53, and with the Oryza sativa sequence represented by SEQ ID NO: 54, encoding the polypeptide of SEQ ID NO: 55, and with the Oryza sativa sequence represented by SEQ ID NO: 56, encoding the polypeptide of SEQ ID NO: 57, and with the Oryza sativa sequence represented by SEQ ID NO: 58, encoding the polypeptide of SEQ ID NO: 59, however performance of the invention is not restricted to these sequences.
- the methods of the invention may be performed using any nucleic acid encoding
- Orthologues and paralogues may easily be found by performing a so-called reciprocal blast search as described in the “definitions” section herein.
- the query sequence is any of SEQ ID NO: 1 or SEQ ID NO: 2, or SEQ ID NO: 50 to SEQ ID NO: 59
- the second BLAST would therefore be against Oryza sequences.
- Table 3 gives examples of orthologues and paralogues of the NAC represented by SEQ ID NO 2.
- Table 4 gives examples of orthologues and paralogues of the NAC represented by SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55 SEQ ID NO: 57 and SEQ ID NO: 59. Further orthologues and paralogues may readily be identified using the BLAST procedure described above and by following the procedure given in the Examples section.
- the NAC proteins are identifiable by the presence of a highly conserved N-terminal NAC domain (shown in FIG. 5 ), accompanied by diverse C-terminal domains.
- NAC domain in a NAC transcription factor may be identified as explained in the “definitions” section.
- NAC domains may also be identified using routine techniques, such as by sequence alignment as explained in the “definitions” section herein.
- the invention also provides hitherto unknown NAC-encoding nucleic acids and NAC polypeptides.
- nucleic acid encoding a NAC polypeptide having, in increasing order of preference, at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% or more sequence identity to the amino acid sequence represented by one of SEQ ID NO: 348, SEQ ID NO: 350, SEQ ID NO: 352, SEQ ID NO: 354, SEQ ID NO: 356, SEQ ID NO: 358, SEQ ID NO: 360, SEQ ID NO: 362, or SEQ ID NO: 364.
- polypeptide comprising:
- SEQ ID NO: 352 SEQ ID NO: 354, SEQ ID NO: 356, SEQ ID NO: 358, SEQ ID NO: 360, SEQ ID NO: 362, or SEQ ID NO: 364;
- amino acid sequence having, in increasing order of preference, at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% or more sequence identity to the amino acid sequence represented by one of SEQ ID NO: 348, SEQ ID NO: 350, SEQ ID NO: 352, SEQ ID NO: 354, SEQ ID NO: 356, SEQ ID NO: 358, SEQ ID NO: 360, SEQ ID NO: 362, or SEQ ID NO: 364; (iii) derivatives of any of the amino acid sequences given in (i) or (ii) above.
- Nucleic acids encoding NAC transcription factors defined herein need not be full-length nucleic acids, since performance of the methods of the invention does not rely on the use of full length nucleic acid sequences.
- Examples of nucleic acids suitable for use in performing the methods of the invention include the nucleic acid sequences given in Tables 3 and 4, but are not limited to those sequences. Nucleic acid variants may also be useful in practicing the methods of the invention.
- nucleic acid variants examples include portions of nucleic acids encoding a NAC transcription factor as defined herein, splice variants of nucleic acids encoding a NAC transcription factor as defined herein, allelic variants of nucleic acids encoding a NAC transcription factor as defined herein and variants of nucleic acids encoding a NAC transcription factor as defined herein that are obtained by gene shuffling.
- the terms portion, splice variant, allelic variant and gene shuffling will now be described.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a portion of any one of the nucleic acid sequences given in Tables 3 and 4, or a portion of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Tables 3 and 4.
- Portions useful in the methods of the invention encode a polypeptide falling within the definition of a NAC transcription factor as defined herein and having substantially the same biological activity as the NAC transcription factor represented by any of the amino acid sequences given in Tables 3 and 4.
- the portion is typically at least 600 consecutive nucleotides in length, preferably at least 700 consecutive nucleotides in length, more preferably at least 800 consecutive nucleotides in length and most preferably at least 900 consecutive nucleotides in length, the consecutive nucleotides being of any one of the nucleic acid sequences given in Tables 3 and 4.
- the portion is a portion of any one of the nucleic acids given in Tables 3 and 4.
- the portion is a portion of the nucleic acid of SEQ ID NO: 1, SEQ ID NO: 50, SEQ ID NO: 52, SEQ ID NO: 54, SEQ ID NO: 56 or SEQ ID NO: 58.
- the portion encodes an amino acid sequence comprising any one or more of Motifs I to XI as defined herein.
- a portion of a nucleic acid encoding a NAC transcription factor as defined herein may be prepared, for example, by making one or more deletions to the nucleic acid in question.
- the portions may be used in isolated form or they may be fused to other coding (or non coding) sequences in order to, for example, produce a protein that combines several activities. When fused to other coding sequences, the resultant polypeptide produced upon translation may be bigger than that predicted for the NAC transcription factor portion.
- nucleic acid variant useful in the methods of the invention is a nucleic acid capable of hybridising, under reduced stringency conditions, preferably under stringent conditions, with a nucleic acid encoding a NAC transcription factor as defined herein, or with a portion as defined herein.
- Hybridising sequences useful in the methods of the invention encode a polypeptide having a NAC domain (as described above) and having substantially the same biological activity as the NAC transcription factor represented by any of the amino acid sequences given in Tables 3 and 4.
- the hybridising sequence is typically at least 600 consecutive nucleotides in length, preferably at least 700 consecutive nucleotides in length, more preferably at least 800 consecutive nucleotides in length and most preferably at least 900 consecutive nucleotides in length.
- the hybridising sequence is one that is capable of hybridising to any of the nucleic acids given in Table 3 and 4, or to a portion of any of these sequences, a portion being as defined above.
- the hybridising sequence is capable of hybridising to a nucleic acid as represented by SEQ ID NO: 1, SEQ ID NO: 50, SEQ ID NO: 52, SEQ ID NO: 54, SEQ ID NO: 56 or SEQ ID NO: 58 capable of hybridising to a portion of any of the aforementioned sequences.
- the sequence capable of hybridizing encodes a polypeptide comprising any one or more of Motifs I to XI as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a nucleic acid capable of hybridizing to any one of the nucleic acids given in Tables 3 and 4, or comprising introducing and expressing in a plant a nucleic acid capable of hybridising to a nucleic acid encoding an orthologue, paralogue or homologue of any of the nucleic acid sequences given in Tables 3 and 4.
- nucleic acid variant useful in the methods of the invention is a splice variant encoding a NAC transcription factor as defined hereinabove.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a splice variant of any one of the nucleic acid sequences given in Tables 3 and 4, or a splice variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Tables 3 and 4.
- Preferred splice variants are splice variants of a nucleic acid represented by any of SEQ ID NO: 1, SEQ ID NO: 50, SEQ ID NO: 52, SEQ ID NO: 54, SEQ ID NO: 56 or SEQ ID NO: 58, or splice variants encoding orthologues or paralogues of any of the amino acid sequences given in Tables 3 and 4.
- the splice variants encode a polypeptide comprising any one or more of Motifs I to XI as defined herein.
- nucleic acid variant useful in performing the methods of the invention is an allelic variant of a nucleic acid encoding a NAC transcription factor as defined hereinabove.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant an allelic variant of any one of the nucleic acids given in Tables 3 and 4, or comprising introducing and expressing in a plant an allelic variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Tables 3 and 4.
- the allelic variant is an allelic variant of SEQ ID NO: 1, SEQ ID NO: 50, SEQ ID NO: 52, SEQ ID NO: 54, SEQ ID NO: 56 or SEQ ID NO: 58, or an allelic variant of a nucleic acid encoding an orthologue or paralogue of any of the aforementioned SEQ ID NOs.
- the allelic variant encodes a polypeptide comprising any one or more of Motifs I to XI as defined herein.
- a further nucleic acid variant useful in the methods of the invention is a nucleic acid variant obtained by gene shuffling. Gene shuffling or directed evolution may also be used to generate variants of nucleic acids encoding NAC transcription factors as defined above.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a variant of any one of the nucleic acid sequences given in Tables 3 and 4, or comprising introducing and expressing in a plant a variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Tables 3 and 4, which variant nucleic acid is obtained by gene shuffling.
- the variants obtained by gene shuffling encode a polypeptide comprising any one or more of Motifs I to XI as defined herein.
- nucleic acid variants may also be obtained by site-directed mutagenesis.
- site-directed mutagenesis Several methods are available to achieve site-directed mutagenesis, the most common being PCR based methods (current protocols in molecular biology. Wiley Eds).
- nucleic acids encoding homologues of any one of the amino acid sequences given in Tables 3 and 4.
- nucleic acids encoding derivatives of any one of the amino acids given in Table 3 or orthologues or paralogues of any of the aforementioned SEQ ID NOs.
- Preferred derivatives are derivatives of the proteins represented by SEQ ID NO: 2, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55, SEQ ID NO: 57 or SEQ ID NO: 59.
- NAC transcription factors typically have DNA-binding activity and an activation domain.
- a person skilled in the art may easily determine the presence of an activation domain and DNA-binding activity using routine tools and techniques.
- Nucleic acids encoding NAC transcription factors may be derived from any natural or artificial source.
- the nucleic acid may be modified from its native form in composition and/or genomic environment through deliberate human manipulation.
- the NAC transcription factor-encoding nucleic acid is from a plant, further preferably from a monocot, more preferably from the Poaceae family, most preferably the nucleic acid is from Oryza sativa.
- NAC transcription factor Any reference herein to a NAC transcription factor is therefore taken to mean a NAC transcription factor as defined above. Any nucleic acid encoding such a NAC transcription factor is suitable for use in performing the methods of the invention.
- the present invention also encompasses plants or parts thereof (including seeds) obtainable by the methods according to the present invention.
- the plants or parts thereof comprise a nucleic acid transgene encoding a NAC transcription factor as defined above.
- the invention also provides genetic constructs and vectors to facilitate introduction and/or expression of the nucleic acid sequences useful in the methods according to the invention, in a plant.
- Constructs useful in the methods according to the present invention may be constructed using recombinant DNA technology well known to persons skilled in the art.
- the gene constructs may be inserted into vectors, which may be commercially available, suitable for transforming into plants and suitable for expression of the gene of interest in the transformed cells.
- the invention therefore provides use of a gene construct as defined hereinabove in the methods of the invention.
- Plants are transformed with a vector comprising the sequence of interest (i.e., a nucleic acid encoding a NAC transcription factor).
- sequence of interest i.e., a nucleic acid encoding a NAC transcription factor.
- the skilled artisan is well aware of the genetic elements that must be present in the vector in order to successfully transform, select and propagate host cells containing the sequence of interest.
- the sequence of interest is operably linked to one or more control sequences (at least to a promoter).
- the nucleic acid encoding a NAC transcription factor is operably linked to a constitutive promoter.
- a constitutive promoter is transcriptionally active during most but not necessarily all phases of its growth and development and is substantially ubiquitously expressed.
- the constitutive promoter is preferably a GOS2 promoter, more preferably the constitutive promoter is a rice GOS2 promoter, further preferably the constitutive promoter is represented by a nucleic acid sequence substantially similar to SEQ ID NO: 39 or SEQ ID NO: 339, most preferably the constitutive promoter is as represented by SEQ ID NO: 39 or SEQ ID NO: 339.
- the nucleic acid encoding a NAC-type transcription factor is operably linked to a young green tissue-specific promoter.
- a young green tissue-specific promoter as defined herein is a promoter that is transcriptionally active predominantly in young green tissue, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts.
- the young green tissue-specific promoter is preferably a protochlorophylid reductase promoter, more preferably the protochlorophylid reductase promoter represented by a nucleic acid sequence substantially similar to SEQ ID NO: 40, most preferably the promoter is as represented by SEQ ID NO: 40.
- the nucleic acid encoding a NAC-type transcription factor is operably linked to a root-specific promoter (internal reference pro0110).
- a root-specific promoter as defined herein is a promoter that is transcriptionally active predominantly in plant roots, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts.
- the root-specific promoter is preferably an RCc3 promoter (Plant Mol Biol.
- the RCc3 promoter is from rice, further preferably the RCc3 promoter is represented by a nucleic acid sequence substantially similar to SEQ ID NO: 110, most preferably the promoter is as represented by SEQ ID NO: 110.
- root-specific promoters which may also be used to perform the methods of the invention are shown in Table 2b above.
- one or more terminator sequences may be used in the construct introduced into a plant.
- Additional regulatory elements may include transcriptional as well as translational enhancers.
- terminator and enhancer sequences may be suitable for use in performing the invention.
- An intron sequence may also be added to the 5′ untranslated region (UTR) or in the coding sequence to increase the amount of the mature message that accumulates in the cytosol, as described in the definitions section.
- Other control sequences (besides promoter, enhancer, silencer, intron sequences, 3′UTR and/or 5′UTR regions) may be protein and/or RNA stabilizing elements. Such sequences would be known or may readily be obtained by a person skilled in the art.
- the genetic constructs of the invention may further include an origin of replication sequence that is required for maintenance and/or replication in a specific cell type.
- an origin of replication sequence that is required for maintenance and/or replication in a specific cell type.
- Preferred origins of replication include, but are not limited to, the f1-ori and colE1.
- the genetic construct may optionally comprise a selectable marker gene. Selectable markers are described in more detail in the “definitions” section herein.
- the marker genes may be removed or excised from the transgenic cell once they are no longer needed. Techniques for marker removal are known in the art, useful techniques are described above in the definitions section.
- the invention also provides a method for the production of transgenic plants having enhanced yield-related traits relative to control plants, comprising introduction and expression in a plant of any nucleic acid encoding a NAC transcription factor as defined hereinabove.
- the present invention provides a method for the production of transgenic plants having enhanced yield-related traits, which method comprises:
- the nucleic acid may be introduced directly into a plant cell or into the plant itself (including introduction into a tissue, organ or any other part of a plant). According to a preferred feature of the present invention, the nucleic acid is preferably introduced into a plant by transformation.
- the genetically modified plant cells can be regenerated via all methods with which the skilled worker is familiar. Suitable methods can be found in the abovementioned publications by S. D. Kung and R. Wu, Potrykus or Höfgen and Willmitzer.
- plant cells or cell groupings are selected for the presence of one or more markers which are encoded by plant-expressible genes co-transferred with the gene of interest, following which the transformed material is regenerated into a whole plant.
- the plant material obtained in the transformation is, as a rule, subjected to selective conditions so that transformed plants can be distinguished from untransformed plants.
- the seeds obtained in the above-described manner can be planted and, after an initial growing period, subjected to a suitable selection by spraying.
- a further possibility consists in growing the seeds, if appropriate after sterilization, on agar plates using a suitable selection agent so that only the transformed seeds can grow into plants.
- the transformed plants are screened for the presence of a selectable marker such as the ones described above.
- putatively transformed plants may also be evaluated, for instance using Southern analysis, for the presence of the gene of interest, copy number and/or genomic organisation.
- expression levels of the newly introduced DNA may be monitored using Northern and/or Western analysis, both techniques being well known to persons having ordinary skill in the art.
- the generated transformed plants may be propagated by a variety of means, such as by clonal propagation or classical breeding techniques.
- a first generation (or T1) transformed plant may be selfed and homozygous second-generation (or T2) transformants selected, and the T2 plants may then further be propagated through classical breeding techniques.
- the generated transformed organisms may take a variety of forms. For example, they may be chimeras of transformed cells and non-transformed cells; clonal transformants (e.g., all cells transformed to contain the expression cassette); grafts of transformed and untransformed tissues (e.g., in plants, a transformed rootstock grafted to an untransformed scion).
- the present invention clearly extends to any plant cell or plant produced by any of the methods described herein, and to all plant parts and propagules thereof.
- the present invention extends further to encompass the progeny of a primary transformed or transfected cell, tissue, organ or whole plant that has been produced by any of the aforementioned methods, the only requirement being that progeny exhibit the same genotypic and/or phenotypic characteristic(s) as those produced by the parent in the methods according to the invention.
- the invention also includes host cells containing an isolated nucleic acid encoding a NAC transcription factor as defined hereinabove.
- Preferred host cells according to the invention are plant cells.
- the invention also extends to harvestable parts of a plant such as, but not limited to seeds, leaves, fruits, flowers, stems, rhizomes, tubers and bulbs.
- the invention furthermore relates to products derived, preferably directly derived, from a harvestable part of such a plant, such as dry pellets or powders, oil, fat and fatty acids, starch or proteins.
- the modulated expression is increased expression.
- Methods for increasing expression of nucleic acids or genes, or gene products are well documented in the art. Examples of methods for increasing expression are given in the “definitions” section herein.
- a preferred method for modulating (preferably, increasing) expression of a nucleic acid encoding a NAC transcription factor is by introducing and expressing in a plant a nucleic acid encoding a NAC transcription factor; however the effects of performing the method, i.e. enhancing yield-related traits may also be achieved using other well known techniques, such as T-DNA activation, TILLING, homologous recombination or directed evolution. A description of some of these techniques is given in the “definitions” section herein.
- performance of the methods of the invention gives plants having an increased growth rate relative to control plants, particularly during the early stages of plant development (typically three weeks post germination in the case of rice and maize, but this will vary from species to species) leading to early vigour. Therefore, according to the present invention, there is provided a method for increasing the growth rate of plants, which method comprises modulating expression, preferably increasing expression, in a plant of a nucleic acid encoding a particular type of NAC transcription factor, as defined herein.
- the present invention also provides a method for obtaining plants having early vigour relative to control plants, which method comprises modulating, preferably increasing, expression in a plant of a nucleic acid encoding a NAC transcription factor as defined herein.
- Early vigour may also result from or be manifested as increased plant fitness relative to control plants due to, for example, the plants being better adapted to their environment (i.e. being more able to cope with various abiotic or biotic stress factors). Plants having early vigour also show better establishment of the crop (with the crop growing in uniform manner, i.e. with the majority of plants reaching the various stages of development at substantially the same time), and show better growth and often better yield. Early vigour may be determined by measuring various factors, such as seedling growth rate, thousand kernel weight, percentage germination, percentage emergence, seedling height, root length and shoot biomass and many more.
- Performance of the methods of the invention gives plants grown under non-stress conditions or under mild drought conditions increased yield relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield in plants grown under non-stress conditions or under mild drought conditions, which method comprises increasing expression in a plant of a nucleic acid encoding a NAC transcription factor.
- Performance of the methods of the invention gives plants grown under conditions of nutrient deficiency, particularly under conditions of nitrogen deficiency, increased yield relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield in plants grown under conditions of nutrient deficiency, which method comprises increasing expression in a plant of a nucleic acid encoding a POI polypeptide. Nutrient deficiency may result from a lack of nutrients such as nitrogen, phosphates and other phosphorous-containing compounds, potassium, calcium, cadmium, magnesium, manganese, iron and boron, amongst others.
- nucleic acids encoding NAC4 transcription factors for example, SEQ ID NO: 52
- NAC4 transcription factors themselves for example SEQ ID NO: 53
- a “NAC4 transcription factor” as defined herein refers to any amino acid sequence which when used in the construction of a NAC phylogenetic tree, such as the one depicted in FIG. 1 , tends to cluster with the group of NACs comprising an amino acid sequence represented by SEQ ID NO: 53 rather than with any other NAC group.
- the NAC4 transcription factor may also comprise Motif XI: DSMPRLHADSSCSE, or a motif having in increasing order of preference at least 50%, 60%, 70%, 80% or 90% sequence identity to the sequence of Motif XI.
- Motif XI is preferably DS M/V/I P R/K L/I/A H T/A/S D/E SS C/G SE.
- Motif XI is typically found in NACs of SEQ ID NO: 53 and SEQ ID NO: 55 and in NACs clustering (in a phylogenetic tree) with the NACs represented by the aforementioned SEQ ID NOs rather than with any other NAC group. Motif XI may comprise one or more conservative amino acid substitution at any position.
- Mild stress on the other hand is defined herein as being any stress to which a plant is exposed which does not result in the plant ceasing to grow altogether without the capacity to resume growth. Mild stress in the sense of the invention leads to a reduction in the growth of the stressed plants of less than 40%, 35% or 30%, preferably less than 25%, 20% or 15%, more preferably less than 14%, 13%, 12%, 11% or 10% or less in comparison to the control plant under non-stress conditions. Due to advances in agricultural practices (irrigation, fertilization, pesticide treatments) severe stresses are not often encountered in cultivated crop plants.
- Mild stresses are the typical stresses to which a plant may be exposed. These stresses may be the everyday biotic and/or abiotic (environmental) stresses to which a plant is exposed. Typical abiotic or environmental stresses include temperature stresses caused by atypical hot or cold/freezing temperatures; salt stress; water stress (drought or excess water), anaerobic stress, chemical toxicity and oxidative stress.
- the abiotic stress may be an osmotic stress caused by a water stress (particularly due to drought), salt stress, oxidative stress or an ionic stress. Chemicals may also cause abiotic stresses (for example too high or too low concentrations of minerals or nutrients).
- Biotic stresses are typically those stresses caused by pathogens, such as bacteria, viruses, fungi and insects.
- the term “non-stress conditions” as used herein are those environmental conditions that do not significantly go beyond the everyday climatic and other abiotic conditions that plants may encounter, and which allow optimal growth of the plant. Persons skilled in the art are aware of normal soil conditions and climatic conditions for a given geographic location.
- Abiotic stress leads to a series of morphological, physiological, biochemical and molecular changes that adversely affect plant growth and productivity (Wang et al. (Planta (2003) 218: 1-14). Drought, salinity, extreme temperatures and oxidative stress are known to be interconnected and may induce growth and cellular damage through similar mechanisms. For example, drought and/or salinisation are manifested primarily as osmotic stress, resulting in the disruption of homeostasis and ion distribution in the cell. Oxidative stress, which frequently accompanies high or low temperature, salinity or drought stress may cause denaturation of functional and structural proteins. As a consequence, these diverse environmental stresses often activate similar cell signaling pathways and cellular responses, such as the production of stress proteins, up-regulation of anti-oxidants, accumulation of compatible solutes and growth arrest.
- the exemplification of the present invention with drought stress should not be seen as a limitation to drought stress, but more as a screen to indicate the involvement of NAC4-encoding nucleic acids and NAC4 transcription factors in abiotic stresses in general.
- the methods of the present invention may be performed under non-stress conditions or under conditions of mild drought to give plants having enhanced yield-related traits (particularly increased yield and seed yield) relative to control plants.
- nucleic acids encoding NAC4 transcription factors, and NAC4 transcription factors themselves would, along with their usefulness in conferring salt-tolerance in plants, also find use in protecting the plant against various other abiotic stresses.
- oxidative stress which frequently accompanies high or low temperatures, salinity or drought stress, may cause denaturing of functional and structural proteins.
- these diverse environmental stresses often activate similar cell signaling pathways and cellular responses, such as the production of stress proteins, up-regulation of anti-oxidants, accumulation of compatible solutes and growth arrest.
- Rabbani et al. 2003, Plant Physiol 133: 1755-1767
- the methods of the invention are therefore advantageously applicable to any plant.
- abiotic stress as defined herein is taken to mean any one or more of: water stress (due to drought or excess water), anaerobic stress, salt stress, nutrient stress, temperature stress (due to hot, cold or freezing temperatures), chemical toxicity stress and oxidative stress.
- the abiotic stress is an osmotic stress, selected from water stress, salt stress, oxidative stress and ionic stress.
- the water stress is drought stress.
- salt stress is not restricted to common salt (NaCl), but may be any one or more of: NaCl, KCl, LiCl, MgCl 2 , CaCl 2 , Phosphorous salts, amongst others.
- Nutrient stress may be caused by a lack or excess of nutrients such as nitrogen, phosphates and other phosphorous-containing compounds, potassium, calcium, cadmium, magnesium, manganese, iron and boron, amongst others.
- Increased tolerance to abiotic stress is manifested by increased plant yield under abiotic stress conditions as defined above.
- increased yield may include one or more of the following: increased seed size, increased seed weight, increased aboveground biomass, increased plant height, increased root biomass, increased number of flowers per panicle and increased number of first panicles, each relative to control plants.
- the abiotic stress is osmotic stress, selected from one or more of the following: water stress, salt stress, oxidative stress, nutrient stress and ionic stress.
- water stress is drought stress.
- Plants that are particularly useful in the methods of the invention include all plants which belong to the superfamily Viridiplantae, in particular monocotyledonous and dicotyledonous plants including fodder or forage legumes, ornamental plants, food crops, trees or shrubs.
- the plant is a crop plant. Examples of crop plants include soybean, sunflower, canola, alfalfa, rapeseed, cotton, tomato, potato and tobacco. Further preferably, the plant is a monocotyledonous plant. Examples of monocotyledonous plants include sugarcane. More preferably the plant is a cereal.
- cereals examples include rice, maize, wheat, barley, millet, triticale, rye, sorghum and oats.
- Plants in which early vigour is a particularly desirably trait include rice, maize, wheat, sunflower, sorghum.
- the present invention also encompasses use of nucleic acids encoding NAC transcription factors and use of NAC transcription factor polypeptides in enhancing yield-related traits.
- Nucleic acids encoding NAC transcription factors or NAC transcription factors themselves may find use in breeding programmes in which a DNA marker is identified which may be genetically linked to a NAC transcription factor-encoding gene.
- the nucleic acids/genes, or the NAC transcription factors themselves may be used to define a molecular marker. This DNA or protein marker may then be used in breeding programmes to select plants having enhanced yield as defined hereinabove in the methods of the invention.
- Allelic variants of NAC transcription factor-encoding nucleic acids/genes may also find use in marker-assisted breeding programmes. Such breeding programmes sometimes require introduction of allelic variation by mutagenic treatment of the plants, using for example EMS mutagenesis; alternatively, the programme may start with a collection of allelic variants of so called “natural” origin caused unintentionally. Identification of allelic variants then takes place, for example, by PCR. This is followed by a step for selection of superior allelic variants of the sequence in question and which give increased yield. Selection is typically carried out by monitoring growth performance of plants containing different allelic variants of the sequence in question. Growth performance may be monitored in a greenhouse or in the field. Further optional steps include crossing plants in which the superior allelic variant was identified with another plant. This could be used, for example, to make a combination of interesting phenotypic features.
- Nucleic acids encoding NAC transcription factors may also be used as probes for genetically and physically mapping the genes that they are a part of, and as markers for traits linked to those genes. Such information may be useful in plant breeding in order to develop lines with desired phenotypes. Such use of NAC transcription factor encoding nucleic acids requires only a nucleic acid sequence of at least 15 nucleotides in length. The NAC transcription factor-encoding nucleic acids may be used as restriction fragment length polymorphism (RFLP) markers. Southern blots (Sambrook J, Fritsch E F and Maniatis T (1989) Molecular Cloning, A Laboratory Manual) of restriction-digested plant genomic DNA may be probed with the NAC transcription factor-encoding nucleic acids.
- RFLP restriction fragment length polymorphism
- the resulting banding patterns may then be subjected to genetic analyses using computer programs such as MapMaker (Lander et al. (1987) Genomics 1: 174-181) in order to construct a genetic map.
- the nucleic acids may be used to probe Southern blots containing restriction endonuclease-treated genomic DNAs of a set of individuals representing parent and progeny of a defined genetic cross. Segregation of the DNA polymorphisms is noted and used to calculate the position of the NAC transcription factor-encoding nucleic acid in the genetic map previously obtained using this population (Botstein et al. (1980) Am. J. Hum. Genet. 32:314-331).
- the nucleic acid probes may also be used for physical mapping (i.e., placement of sequences on physical maps; see Hoheisel et al. In: Non-mammalian Genomic Analysis: A Practical Guide, Academic press 1996, pp. 319-346, and references cited therein).
- the nucleic acid probes may be used in direct fluorescence in situ hybridisation (FISH) mapping (Trask (1991) Trends Genet. 7:149-154).
- FISH direct fluorescence in situ hybridisation
- the present invention further provides a method for enhancing yield-related traits in plants relative to control plants, comprising modulating expression in a plant of a nucleic acid encoding an AP2-2 polypeptide.
- a preferred method for modulating (preferably, increasing) expression of a nucleic acid encoding an AP2-2 polypeptide is by introducing and expressing in a plant a nucleic acid encoding an AP2-2 polypeptide.
- AP2-2 polypeptide refers to a transcription factor that classifies as an ERF protein, and more particularly as a member of Group VII of the ERF proteins, according to the definition by Nakano et al. (2006).
- Group VII of ERF proteins is, besides the presence of a single AP2/ERF domain, which is part of all ERF proteins, also characterised by other motifs, such as CMVII-1 to CMVII-8 (Nakano et al., 2006). These CMVII motifs were delineated based on analysis of Arabidopsis thaliana and Oryza sativa sequences and are part of the Arabidopsis and/or rice sequences ( FIG. 2 ), but may also be present in Group VII ERF proteins of other species.
- the AP2-2 polypeptide useful in the methods of the present invention comprises the conserved
- motif XII is (R/I/K)(R/K/Q/D/A)(I/L)(R/Y/H)G(A/S/R/K/T/D/E/G/H/ L/N)(K/T/R/N/G)A(K/R/E)(V/L/P/T)NF(P/V)
- motif XII is (R/I/K)(R/K/Q/D/A)(I/L)(R/Y/H)G(A/S/R/K/T/D/E/G/H/ L/N)(K/T/R/N/G)A(K/R/E)(V/L/P/T)NF(P/V/A)
- the AP2-2 polypeptide useful in the methods of the present invention furthermore also comprises one or more of the following motifs:
- motif XIII is MCGG(A/S)I(I/L)(S/H/A/Y)(D/G/H/Y/E) More preferably motif XIII is MCGG(A/S)I(I/L)(S/H)(D/G/H/E) Motif XIV (SEQ /D NO: 135) (K/N/R/S/H/M/Q/P/A/E)(R/K/H/A/G/E/V/P/M)(E/K/A/R/ S/Q/T/V/G/H/P)(R/K/Q/S/G)(K/G/P/S/R/T/A/N)(T/N)(T/N)(T/N)
- motifs were derived mainly from Arabidopsis and rice sequences, therefore, one or more conserved substitutions are allowed in these motifs for AP2-2 sequences from other plant species.
- AP2-2 polypeptides may have DNA-binding activity. Tools and techniques for measuring DNA-binding activity are well known in the art.
- domain and “motif” are defined in the “definitions” section herein. Specialist databases exist for the identification of domains. Examples are given in the “definitions” section herein.
- the present invention is illustrated by transforming plants with the nucleic acid sequence represented by SEQ ID NO: 131, encoding the polypeptide sequence of SEQ ID NO: 132.
- performance of the invention is not restricted to these sequences; the methods of the invention may advantageously be performed using any AP2-2-encoding nucleic acid or AP2-2 polypeptides as defined herein.
- nucleic acids encoding AP2-2 polypeptides are given in Table 14 of Example 9 herein. Such nucleic acids are useful in performing the methods of the invention.
- the amino acid sequences given in Table 14 of Example 9 are example sequences of orthologues and paralogues of the AP2-2 polypeptides represented by SEQ ID NO: 132, the terms “orthologues” and “paralogues” being as defined herein. Further orthologues and paralogues may readily be identified by performing a so-called reciprocal blast search.
- the invention also provides hitherto unknown AP2-2-encoding nucleic acids and AP2-2 polypeptides.
- an isolated nucleic acid molecule comprising:
- nucleic acid represented by one of SEQ ID NO: 341, SEQ ID NO: 343, or SEQ ID NO: 345 (i) a nucleic acid represented by one of SEQ ID NO: 341, SEQ ID NO: 343, or SEQ ID NO: 345; (ii) the complement of a nucleic acid represented by one of SEQ ID NO: 341, SEQ ID NO: 343, or SEQ ID NO: 345; (iii) a nucleic acid encoding a POI polypeptide having, in increasing order of preference, at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% or more sequence identity to the amino acid sequence represented by one of SEQ ID NO: 342, SEQ ID NO: 344, or SEQ ID NO: 346.
- polypeptide comprising:
- nucleic acids encoding homologues and derivatives of any one of the amino acid sequences given in Table 14 of Example 9 are also useful in the methods of the invention.
- homologues and derivatives useful in the methods of the present invention have substantially the same biological and functional activity as the unmodified protein from which they are derived.
- nucleic acid variants useful in practicing the methods of the invention include portions of nucleic acids encoding AP2-2 polypeptides, nucleic acids hybridising to nucleic acids encoding AP2-2 polypeptides, splice variants of nucleic acids encoding AP2-2 polypeptides, allelic variants of nucleic acids encoding AP2-2 polypeptides and variants of nucleic acids encoding AP2-2 polypeptides obtained by gene shuffling.
- the terms hybridising sequence, splice variant, allelic variant and gene shuffling are as described herein.
- Nucleic acids encoding AP2-2 polypeptides need not be full-length nucleic acids, since performance of the methods of the invention does not rely on the use of full-length nucleic acid sequences.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a portion of any one of the nucleic acid sequences given in Table 14 of Example 9, or a portion of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 14 of Example 9.
- a portion of a nucleic acid may be prepared, for example, by making one or more deletions to the nucleic acid.
- the portions may be used in isolated form or they may be fused to other coding (or non-coding) sequences in order to, for example, produce a protein that combines several activities. When fused to other coding sequences, the resultant polypeptide produced upon translation may be bigger than that predicted for the protein portion.
- Portions useful in the methods of the invention encode an AP2-2 polypeptide as defined herein, and have substantially the same biological activity as the amino acid sequences given in Table 14 of Example 9.
- the portion is a portion of any one of the nucleic acids given in Table 14 of Example 9, or is a portion of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table 14 of Example 9.
- the portion is, in increasing order of preference at least 600, 800, 900 or 1000 consecutive nucleotides in length, the consecutive nucleotides being of any one of the nucleic acid sequences given in Table 14 of Example 9, or of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table 14 of Example 9.
- the portion is a portion of the nucleic acid of SEQ ID NO: 131.
- the portion encodes an amino acid sequence comprising (any one or more of the domains or motifs defined herein).
- the portion encodes an amino acid sequence which, when used in the construction of a phylogenetic tree, tends to cluster with the group of AP2-2 polypeptides comprising the amino acid sequence represented by SEQ ID NO: 132 rather than with any other group.
- nucleic acid variant useful in the methods of the invention is a nucleic acid capable of hybridising, under reduced stringency conditions, preferably under stringent conditions, with a nucleic acid encoding an AP2-2 polypeptide as defined herein, or with a portion as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a nucleic acid capable of hybridizing to any one of the nucleic acids given in Table 14 of Example 9, or comprising introducing and expressing in a plant a nucleic acid capable of hybridising to a nucleic acid encoding an orthologue, paralogue or homologue of any of the nucleic acid sequences given in Table 14 of Example 9.
- Hybridising sequences useful in the methods of the invention encode an AP2-2 polypeptide as defined herein, and have substantially the same biological activity as the amino acid sequences given in Table 14 of Example 9.
- the hybridising sequence is capable of hybridising to any one of the nucleic acids given in Table 14 of Example 9, or to a portion of any of these sequences, a portion being as defined above, or wherein the hybridising sequence is capable of hybridising to a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table 14 of Example 9.
- the hybridising sequence is capable of hybridising to a nucleic acid as represented by SEQ ID NO: 131 or to a portion thereof.
- nucleic acid variant useful in the methods of the invention is a splice variant encoding an AP2-2 polypeptide as defined hereinabove, a splice variant being as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a splice variant of any one of the nucleic acid sequences given in Table 14 of Example 9, or a splice variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 14 of Example 9.
- Preferred splice variants are splice variants of a nucleic acid represented by SEQ ID NO: 131, or a splice variant of a nucleic acid encoding an orthologue or paralogue of SEQ ID NO: 132.
- the amino acid sequence encoded by the splice variant comprises any one or more of the motifs or domains as defined herein.
- the amino acid sequence encoded by the splice variant when used in the construction of a phylogenetic tree, tends to cluster with the group of AP2-2 polypeptides comprising the amino acid sequence represented by SEQ ID NO: 132 rather than with any other group.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant an allelic variant of any one of the nucleic acids given in Table 14 of Example 9, or comprising introducing and expressing in a plant an allelic variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 14 of Example 9.
- allelic variants useful in the methods of the present invention have substantially the same biological activity as the AP2-2 polypeptide of SEQ ID NO: 132 and any of the amino acids depicted in Table 14 of Example 9. Allelic variants exist in nature, and encompassed within the methods of the present invention is the use of these natural alleles.
- the allelic variant is an allelic variant of SEQ ID NO: 131 or an allelic variant of a nucleic acid encoding an orthologue or paralogue of SEQ ID NO: 132.
- the amino acid encoded by the allelic variant comprises any one or more of the motifs or domains as defined herein.
- the amino acid sequence encoded by the allelic variant when used in the construction of a phylogenetic tree, tends to cluster with the group of AP2-2 polypeptides comprising the amino acid sequence represented by SEQ ID NO: 132 rather than with any other group.
- Gene shuffling or directed evolution may also be used to generate variants of nucleic acids encoding AP2-2 polypeptides as defined above; the term “gene shuffling” being as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a variant of any one of the nucleic acid sequences given in Table 14 of Example 9, or comprising introducing and expressing in a plant a variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 14 of Example 9, which variant nucleic acid is obtained by gene shuffling.
- the variant nucleic acid obtained by gene shuffling encodes an amino acid sequence comprising any one or more of the motifs or domains as defined herein.
- the amino acid sequence encoded by the variant nucleic acid obtained by gene shuffling when used in the construction of a phylogenetic tree, tends to cluster with the group of AP2-2 polypeptides comprising the amino acid sequence represented by SEQ ID NO: 132 rather than with any other group.
- nucleic acid variants may also be obtained by site-directed mutagenesis.
- site-directed mutagenesis Several methods are available to achieve site-directed mutagenesis, the most common being PCR based methods (Current Protocols in Molecular Biology. Wiley Eds.).
- Nucleic acids encoding AP2-2 polypeptides may be derived from any natural or artificial source.
- the nucleic acid may be modified from its native form in composition and/or genomic environment through deliberate human manipulation.
- the AP2-2 polypeptide-encoding nucleic acid is from a plant, further preferably from a dicotyledonous plant, more preferably from the family Poaceae, more preferably from the genus Oryza , most preferably from Oryza sativa.
- Performance of the methods of the invention gives plants having enhanced yield-related traits.
- performance of the methods of the invention gives plants having increased yield, especially increased seed yield relative to control plants.
- yield and “seed yield” are described in more detail in the “definitions” section herein.
- yield-related traits does not encompass the metabolite content of plant cells and that the enhanced yield-related traits are not the result of increased stress resistance.
- the present invention provides a method for increasing yield, especially seed yield of plants, relative to control plants, which method comprises modulating expression, preferably increasing expression, in a plant of a nucleic acid encoding an AP2-2 polypeptide as defined herein.
- performance of the methods of the invention gives plants having an increased growth rate relative to control plants. Therefore, according to the present invention, there is provided a method for increasing the growth rate of plants, which method comprises modulating expression, preferably increasing expression, in a plant of a nucleic acid encoding an AP2-2 polypeptide as defined herein.
- Performance of the methods of the invention gives plants grown under non-stress conditions or under mild drought conditions increased yield relative to suitable control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield in plants grown under non-stress conditions, which method comprises increasing expression in a plant of a nucleic acid encoding an AP2-2 polypeptide.
- Performance of the methods of the invention gives plants grown under conditions of nutrient deficiency, particularly under conditions of nitrogen deficiency, increased yield relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield in plants grown under conditions of nutrient deficiency, which method comprises increasing expression in a plant of a nucleic acid encoding a POI polypeptide. Nutrient deficiency may result from a lack of nutrients such as nitrogen, phosphates and other phosphorous-containing compounds, potassium, calcium, cadmium, magnesium, manganese, iron and boron, amongst others.
- the present invention encompasses plants or parts thereof (including seeds) obtainable by the methods according to the present invention.
- the plants or parts thereof comprise a nucleic acid transgene encoding an AP2-2 polypeptide as defined above.
- the invention also provides genetic constructs and vectors to facilitate introduction and/or expression in plants of nucleic acids encoding AP2-2 polypeptides.
- the gene constructs may be inserted into vectors, which may be commercially available, suitable for transforming into plants and suitable for expression of the gene of interest in the transformed cells.
- the invention also provides use of a gene construct as defined herein in the methods of the invention.
- the present invention provides a construct comprising:
- control sequence and “termination sequence” are as defined herein. Plants are transformed with a vector comprising any of the nucleic acids described above. The skilled artisan is well aware of the genetic elements that must be present on the vector in order to successfully transform, select and propagate host cells containing the sequence of interest.
- the sequence of interest is operably linked to one or more control sequences (at least to a promoter).
- any type of promoter may be used to drive expression of the nucleic acid sequence.
- a constitutive promoter is particularly useful in the methods of the invention, preferably the constitutive promoter is a strong constitutive promoters. It should be clear that the applicability of the present invention is not restricted to the AP2-2 polypeptide-encoding nucleic acid represented by SEQ ID NO: 131, nor is the applicability of the invention restricted to expression of an AP2-2 polypeptide-encoding nucleic acid when driven by a constitutive promoter.
- the constitutive promoter is preferably a GOS2 promoter, more preferably the rice GOS2 promoter. See Table 2a in the “definitions” section herein for further examples of constitutive promoters.
- control sequences may be protein and/or RNA stabilizing elements. Such sequences would be known or may readily be obtained by a person skilled in the art.
- the genetic constructs of the invention may further include an origin of replication sequence that is required for maintenance and/or replication in a specific cell type.
- an origin of replication sequence that is required for maintenance and/or replication in a specific cell type.
- Preferred origins of replication include, but are not limited to, the f1-ori and colE1.
- the genetic construct may optionally comprise a selectable marker gene.
- selectable markers are described in more detail in the “definitions” section herein.
- the marker genes may be removed or excised from the transgenic cell once they are no longer needed. Techniques for marker removal are known in the art, useful techniques are described above in the definitions section.
- the invention also provides a method for the production of transgenic plants having enhanced yield-related traits relative to control plants, comprising introduction and expression in a plant of any nucleic acid encoding an AP2-2 polypeptide as defined hereinabove.
- the present invention provides a method for the production of transgenic plants having increased yield, which method comprises:
- the nucleic acid may be introduced directly into a plant cell or into the plant itself (including introduction into a tissue, organ or any other part of a plant). According to a preferred feature of the present invention, the nucleic acid is preferably introduced into a plant by transformation.
- transformation is described in more detail in the “definitions” section herein.
- the genetically modified plant cells can be regenerated via all methods with which the skilled worker is familiar. Suitable methods can be found in the abovementioned publications by S. D. Kung and R. Wu, Potrykus or Höfgen and Willmitzer.
- putatively transformed plants may also be evaluated, for instance using Southern analysis, for the presence of the gene of interest, copy number and/or genomic organisation.
- expression levels of the newly introduced DNA may be monitored using Northern and/or Western analysis, both techniques being well known to persons having ordinary skill in the art.
- the generated transformed plants may be propagated by a variety of means, such as by clonal propagation or classical breeding techniques.
- a first generation (or T1) transformed plant may be selfed and homozygous second-generation (or T2) transformants selected, and the T2 plants may then further be propagated through classical breeding techniques.
- the generated transformed organisms may take a variety of forms. For example, they may be chimeras of transformed cells and non-transformed cells; clonal transformants (e.g., all cells transformed to contain the expression cassette); grafts of transformed and untransformed tissues (e.g., in plants, a transformed rootstock grafted to an untransformed scion).
- the present invention clearly extends to any plant cell or plant produced by any of the methods described herein, and to all plant parts and propagules thereof.
- the present invention extends further to encompass the progeny of a primary transformed or transfected cell, tissue, organ or whole plant that has been produced by any of the aforementioned methods, the only requirement being that progeny exhibit the same genotypic and/or phenotypic characteristic(s) as those produced by the parent in the methods according to the invention.
- the invention also includes host cells containing an isolated nucleic acid encoding an AP2-2 polypeptide as defined hereinabove.
- Preferred host cells according to the invention are plant cells.
- Host plants for the nucleic acids or the vector used in the method according to the invention, the expression cassette or construct or vector are, in principle, advantageously all plants, which are capable of synthesizing the polypeptides used in the inventive method.
- Plants that are particularly useful in the methods of the invention include all plants which belong to the superfamily Viridiplantae, in particular monocotyledonous and dicotyledonous plants including fodder or forage legumes, ornamental plants, food crops, trees or shrubs.
- the plant is a crop plant.
- crop plants include soybean, sunflower, canola, alfalfa, rapeseed, cotton, tomato, potato and tobacco.
- the plant is a monocotyledonous plant.
- monocotyledonous plants include sugarcane.
- the plant is a cereal. Examples of cereals include rice, maize, wheat, barley, millet, rye, triticale, sorghum and oats.
- the invention also extends to harvestable parts of a plant such as, but not limited to seeds, leaves, fruits, flowers, stems, rhizomes, tubers and bulbs.
- the invention furthermore relates to products derived, preferably directly derived, from a harvestable part of such a plant, such as dry pellets or powders, oil, fat and fatty acids, starch or proteins.
- the modulated expression is increased expression.
- Methods for increasing expression of nucleic acids or genes, or gene products are well documented in the art. Examples of methods for increasing expression are given in the “definitions” section.
- a preferred method for modulating (preferably, increasing) expression of a nucleic acid encoding an AP2-2 polypeptide is by introducing and expressing in a plant a nucleic acid encoding an AP2-2 polypeptide; however the effects of performing the method, i.e. enhancing yield-related traits may also be achieved using other well known techniques. A description of some of these techniques will now follow.
- T-DNA activation or TILLING (Targeted Induced Local Lesions In Genomes); for a description of the same see the “definitions” section.
- the present invention also encompasses use of nucleic acids encoding AP2-2 polypeptides as described herein and use of this AP2-2 polypeptide in enhancing any of the aforementioned yield-related traits in plants.
- Nucleic acids encoding AP2-2 polypeptide described herein, or the AP2-2 polypeptides themselves, may find use in breeding programmes in which a DNA marker is identified which may be genetically linked to an AP2-2 polypeptide-encoding gene.
- the nucleic acids/genes, or the AP2-2 polypeptides themselves may be used to define a molecular marker. This DNA or protein marker may then be used in breeding programmes to select plants having enhanced yield-related traits as defined hereinabove in the methods of the invention.
- Allelic variants of an AP2-2 polypeptide-encoding nucleic acid/gene may also find use in marker-assisted breeding programmes. Such breeding programmes sometimes require introduction of allelic variation by mutagenic treatment of the plants, using for example EMS mutagenesis; alternatively, the programme may start with a collection of allelic variants of so called “natural” origin caused unintentionally. Identification of allelic variants then takes place, for example, by PCR. This is followed by a step for selection of superior allelic variants of the sequence in question and which give increased yield. Selection is typically carried out by monitoring growth performance of plants containing different allelic variants of the sequence in question. Growth performance may be monitored in a greenhouse or in the field. Further optional steps include crossing plants in which the superior allelic variant was identified with another plant. This could be used, for example, to make a combination of interesting phenotypic features.
- Nucleic acids encoding AP2-2 polypeptides may also be used as probes for genetically and physically mapping the genes that they are a part of, and as markers for traits linked to those genes. Such information may be useful in plant breeding in order to develop lines with desired phenotypes. Such use of AP2-2 polypeptide-encoding nucleic acids requires only a nucleic acid sequence of at least 15 nucleotides in length. The AP2-2 polypeptide-encoding nucleic acids may be used as restriction fragment length polymorphism (RFLP) markers.
- RFLP restriction fragment length polymorphism
- Southern blots (Sambrook J, Fritsch E F and Maniatis T (1989) Molecular Cloning, A Laboratory Manual) of restriction-digested plant genomic DNA may be probed with the AP2-2-encoding nucleic acids. The resulting banding patterns may then be subjected to genetic analyses using computer programs such as MapMaker (Lander et al. (1987) Genomics 1: 174-181) in order to construct a genetic map.
- the nucleic acids may be used to probe Southern blots containing restriction endonuclease-treated genomic DNAs of a set of individuals representing parent and progeny of a defined genetic cross.
- the nucleic acid probes may also be used for physical mapping (i.e., placement of sequences on physical maps; see Hoheisel et al. In: Non-mammalian Genomic Analysis: A Practical Guide, Academic press 1996, pp. 319-346, and references cited therein).
- the nucleic acid probes may be used in direct fluorescence in situ hybridisation (FISH) mapping (Trask (1991) Trends Genet. 7:149-154).
- FISH direct fluorescence in situ hybridisation
- nucleic acid amplification-based methods for genetic and physical mapping may be carried out using the nucleic acids. Examples can be found in the “definitions” section herein.
- the present invention further provides a method for enhancing yield-related traits in plants relative to control plants, comprising modulating expression in a plant of a nucleic acid encoding an AP2-70-like polypeptide.
- the invention also provides hitherto unknown AP2-70-like-encoding nucleic acids and AP2-70-like polypeptides.
- an isolated nucleic acid molecule comprising:
- polypeptide comprising:
- a preferred method for modulating (preferably, increasing) expression of a nucleic acid encoding an AP2-70-like polypeptide is by introducing and expressing in a plant a nucleic acid encoding an AP2-70-like polypeptide.
- nucleic acid useful in the methods of the invention is taken to mean a nucleic acid capable of encoding such an AP2-70-like polypeptide.
- the nucleic acid to be introduced into a plant is any nucleic acid encoding the type of protein which will now be described, hereafter also named “AP2-70-like nucleic acid” or “AP2-70-like gene”.
- AP2-70-like polypeptides as defined below fall within Group Ib (A-6) according to the classification of Nakano et al., 2006.
- An “AP2-70-like polypeptide” as defined herein refers to any polypeptide comprising the following:
- SEQ ID NO: 332 YRG VRQRHWGKWVAEIRLPRNRTRLWLGTFDTAEEAA LAYD SAAFRLRGE SARLNF.
- the AP2 DNA-binding domain described above under (i) comprises at least residues LPRNRTRLWLGTFDT.
- Motif XVIII (SEQ ID NO: 333) is preferably RLP K/R/Q NX 1 R T/V/M R L/V WLGT F/Y D/E T/S, where X 1 is zero, one or more, and up to 30, gaps.
- Motif XVIII (SEQ ID NO: 333) is RLPRNX 1 RTRLWLGTFDT, wherein X 1 is zero, one or more, and up to 30, gaps.
- AP2-70 polypeptides as defined herein may also comprise one or more of the following motifs:
- Motif XX/SEQ ID NO: 335 WDESESFLLHKYPSLEIDWDAILS, or a motif having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more sequence identity to Motif XX.
- Motif XXI/SEQ ID NO: 336 GPPLHAAVDAKLHAICH, or a motif having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more sequence identity to Motif XXI.
- Motif XXII/SEQ ID NO: 337 GANYLTPAQVLHVQAQLQRLRRP, or a motif having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more sequence identity to Motif XXII.
- Motif XXII/SEQ ID NO: 337 GANYLTPAQVLHVQAQLQRLRRP, or a motif having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more sequence identity to Motif XXII.
- CMI-3 Adapted from Nakano et al., 2006 (CMI-3).
- Motif XXIII/SEQ ID NO: 338 VDSKELMGALAPSMVSFSYPCSEQSASS, or a motif having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more sequence identity to Motif XXIII.
- CMI-4 Nakano et al., 2006
- Motifs XVIII and XX to XXIII described above may comprise one, two or three conservative and/or non-conservative change and/or deletion at any position.
- domain and “motif” is defined in the “definitions” section herein. Specialist databases exist for the identification of domains. Examples are given in the “definitions” section herein.
- AP2-70-like polypeptides typically have DNA-binding activity. Tools and techniques for measuring DNA-binding activity are well known in the art.
- nucleic acids encoding AP2-70-like polypeptides are given in Table 18 of Example 18 herein. Such nucleic acids are useful in performing the methods of the invention.
- the amino acid sequences given in Table 18 of Example 18 are example sequences of orthologues and paralogues of the AP2-70-like polypeptide represented by SEQ ID NO: 258, the terms “orthologues” and “paralogues” being as defined herein.
- Nucleic acid variants may also be useful in practicing the methods of the invention. Examples of such variants include nucleic acids encoding homologues and derivatives of any one of the amino acid sequences given in Table 18 of Example 18, the terms “homologue” and “derivative” being as defined herein. Also useful in the methods of the invention are nucleic acids encoding homologues and derivatives of orthologues or paralogues of any one of the amino acid sequences given in Table 18 of Example 18. Homologues and derivatives useful in the methods of the present invention have substantially the same biological and functional activity as the unmodified protein from which they are derived.
- nucleic acid variants useful in practicing the methods of the invention include portions of nucleic acids encoding AP2-70-like polypeptides, nucleic acids hybridising to nucleic acids encoding AP2-70-like polypeptides, splice variants of nucleic acids encoding AP2-70-like polypeptides, allelic variants of nucleic acids encoding AP2-70-like polypeptides and variants of nucleic acids encoding AP2-70-like polypeptides obtained by gene shuffling.
- the terms hybridising sequence, splice variant, allelic variant and gene shuffling are as described herein.
- Nucleic acids encoding AP2-70-like polypeptides need not be full-length nucleic acids, since performance of the methods of the invention does not rely on the use of full-length nucleic acid sequences.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a portion of any one of the nucleic acid sequences given in Table 18 of Example 18, or a portion of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 18 of Example 18.
- a portion of a nucleic acid may be prepared, for example, by making one or more deletions to the nucleic acid.
- the portions may be used in isolated form or they may be fused to other coding (or non-coding) sequences in order to, for example, produce a protein that combines several activities. When fused to other coding sequences, the resultant polypeptide produced upon translation may be bigger than that predicted for the protein portion.
- Portions useful in the methods of the invention encode an AP2-70-like polypeptide as defined herein, and have substantially the same biological activity as the amino acid sequences given in Table 18 of Example 18.
- the portion is a portion of any one of the nucleic acids given in Table 18 of Example 18, or is a portion of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table 18 of Example 18.
- the portion is, in increasing order of preference at least 600, 650, 700, 750 consecutive nucleotides in length, the consecutive nucleotides being of any one of the nucleic acid sequences given in Table 18 of Example 18, or of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table 18 of Example 18.
- the portion is a portion of the nucleic acid of SEQ ID NO: 257.
- the portion encodes an amino acid sequence which when used in the construction of a phylogenetic tree, such as the one depicted in FIGS.
- Group I(A-6), specifically Group Ib: see Nakanao et al., 2006 for classification the amino acid sequence represented by SEQ ID NO: 258 rather than with any other group.
- nucleic acid variant useful in the methods of the invention is a nucleic acid capable of hybridising, under reduced stringency conditions, preferably under stringent conditions, with a nucleic acid encoding an AP2-70-like polypeptide as defined herein, or with a portion as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a nucleic acid capable of hybridizing to any one of the nucleic acids given in Table 18 of Example 18, or comprising introducing and expressing in a plant a nucleic acid capable of hybridising to a nucleic acid encoding an orthologue, paralogue or homologue of any of the nucleic acid sequences given in Table 18 of Example 18.
- Hybridising sequences useful in the methods of the invention encode an AP2-70-like polypeptide as defined herein, and have substantially the same biological activity as the amino acid sequences given in Table 18 of Example 18.
- the hybridising sequence is capable of hybridising to any one of the nucleic acids given in Table 18 of Example 18, or to a portion of any of these sequences, a portion being as defined above, or wherein the hybridising sequence is capable of hybridising to a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table 18 of Example 18.
- the hybridising sequence is capable of hybridising to a nucleic acid as represented by SEQ ID NO: 257 or to a portion thereof.
- the hybridising sequence encodes an amino acid sequence which when used in the construction of a phylogenetic tree, such as the one depicted in FIGS. 3 and 4 , tends to cluster with the group of AP2-70-like polypeptides (Group I(A-6), specifically Group Ib: see Nakanao et al., 2006 for classification) comprising the amino acid sequence represented by SEQ ID NO: 258 rather than with any other group.
- group of AP2-70-like polypeptides Group I(A-6), specifically Group Ib: see Nakanao et al., 2006 for classification
- nucleic acid variant useful in the methods of the invention is a splice variant encoding an AP2-70-like polypeptide as defined hereinabove, a splice variant being as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a splice variant of any one of the nucleic acid sequences given in Table 18 of Example 18, or a splice variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 18 of Example 18.
- Preferred splice variants are splice variants of a nucleic acid represented by SEQ ID NO: 257, or a splice variant of a nucleic acid encoding an orthologue or paralogue of SEQ ID NO: 258.
- the amino acid sequence encoded by the splice variant when used in the construction of a phylogenetic tree, such as the one depicted in FIGS. 3 and 4 , tends to cluster with the group of AP2-70-like polypeptides (Group I(A-6), specifically Group Ib: see Nakanao et al., 2006 for classification) comprising the amino acid sequence represented by SEQ ID NO: 258 rather than with any other group.
- nucleic acid variant useful in performing the methods of the invention is an allelic variant of a nucleic acid encoding an AP2-70-like polypeptide as defined hereinabove, an allelic variant being as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant an allelic variant of any one of the nucleic acids given in Table 18 of Example 18, or comprising introducing and expressing in a plant an allelic variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 18 of Example 18.
- allelic variants useful in the methods of the present invention have substantially the same biological activity as the AP2-70-like polypeptide of SEQ ID NO: 258 and any of the amino acids depicted in Table 18 of Example 18. Allelic variants exist in nature, and encompassed within the methods of the present invention is the use of these natural alleles.
- the allelic variant is an allelic variant of SEQ ID NO: 257 or an allelic variant of a nucleic acid encoding an orthologue or paralogue of SEQ ID NO: 258.
- the amino acid sequence encoded by the allelic variant when used in the construction of a phylogenetic tree, such as the one depicted in FIGS.
- Gene shuffling or directed evolution may also be used to generate variants of nucleic acids encoding AP2-70-like polypeptides as defined above; the term “gene shuffling” being as defined herein.
- a method for enhancing yield-related traits in plants comprising introducing and expressing in a plant a variant of any one of the nucleic acid sequences given in Table 18 of Example 18, or comprising introducing and expressing in a plant a variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table 18 of Example 18, which variant nucleic acid is obtained by gene shuffling.
- the amino acid sequence encoded by the variant nucleic acid obtained by gene shuffling when used in the construction of a phylogenetic tree such as the one depicted in FIGS. 3 and 4 , tends to cluster with the group of AP2-70-like polypeptides (Group I(A-6), specifically Group Ib: see Nakanao et al., 2006 for classification) comprising the amino acid sequence represented by SEQ ID NO: 258 rather than with any other group.
- Group I(A-6) specifically Group Ib: see Nakanao et al., 2006 for classification
- nucleic acid variants may also be obtained by site-directed mutagenesis.
- site-directed mutagenesis Several methods are available to achieve site-directed mutagenesis, the most common being PCR based methods (Current Protocols in Molecular Biology. Wiley Eds.).
- Nucleic acids encoding AP2-70-like polypeptides may be derived from any natural or artificial source.
- the nucleic acid may be modified from its native form in composition and/or genomic environment through deliberate human manipulation.
- the AP2-70-like polypeptide-encoding nucleic acid is from a plant, further preferably from a monocotyledonous plant, more preferably from the family poaceae, most preferably the nucleic acid is from Oryza sativa.
- Performance of the methods of the invention gives plants having enhanced yield-related traits.
- performance of the methods of the invention gives plants having increased yield, especially increased seed yield relative to control plants.
- the present invention provides a method for increasing yield, especially seed yield of plants, relative to control plants, which method comprises modulating expression, preferably increasing expression, in a plant of a nucleic acid encoding an AP2-70-like polypeptide as defined herein.
- performance of the methods of the invention gives plants having an increased growth rate relative to control plants. Therefore, according to the present invention, there is provided a method for increasing the growth rate of plants, which method comprises modulating expression, preferably increasing expression, in a plant of a nucleic acid encoding an AP2-70-like polypeptide as defined herein.
- Performance of the methods of the invention gives plants grown under non-stress conditions or under mild drought conditions increased yield relative to suitable control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield in plants grown under non-stress conditions or under mild drought conditions, which method comprises increasing expression in a plant of a nucleic acid encoding an AP2-70-like polypeptide.
- Performance of the methods of the invention gives plants grown under conditions of nutrient deficiency, particularly under conditions of nitrogen deficiency, increased yield relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield in plants grown under conditions of nutrient deficiency, which method comprises increasing expression in a plant of a nucleic acid encoding an AP2-70-like polypeptide. Nutrient deficiency may result from a lack or excess of nutrients such as nitrogen, phosphates and other phosphorous-containing compounds, potassium, calcium, cadmium, magnesium, manganese, iron and boron, amongst others.
- the present invention encompasses plants or parts thereof (including seeds) obtainable by the methods according to the present invention.
- the plants or parts thereof comprise a nucleic acid transgene encoding an AP2-70-like polypeptide as defined above.
- the invention also provides genetic constructs and vectors to facilitate introduction and/or expression in plants of nucleic acids encoding AP2-70-like polypeptides.
- the gene constructs may be inserted into vectors, which may be commercially available, suitable for transforming into plants and suitable for expression of the gene of interest in the transformed cells.
- the invention also provides use of a gene construct as defined herein in the methods of the invention.
- the present invention provides a construct comprising:
- nucleic acid encoding an AP2-70-like polypeptide is:
- control sequence and “termination sequence” are as defined herein.
- Plants are transformed with a vector comprising any of the nucleic acids described above.
- the skilled artisan is well aware of the genetic elements that must be present on the vector in order to successfully transform, select and propagate host cells containing the sequence of interest.
- the sequence of interest is operably linked to one or more control sequences (at least to a promoter).
- any type of promoter may be used to drive expression of the nucleic acid sequence.
- a constitutive promoter is particularly useful in the methods. See the “Definitions” section herein for definitions of the various promoter types. Also useful in the methods of the invention is a root-specific promoter.
- the constitutive promoter is preferably a GOS2 promoter, preferably a GOS2 promoter from rice. Further preferably the constitutive promoter is represented by a nucleic acid sequence substantially similar to SEQ ID NO: 39 or SEQ ID NO: 339 most preferably the constitutive promoter is as represented by SEQ ID NO: 39 or SEQ ID NO: 339. See Table 2a in the “Definitions” section herein for further examples of constitutive promoters.
- the nucleic acid encoding an AP2-70-like polypeptide is operably linked to a root-specific promoter.
- the root-specific promoter is preferably an RCc3 promoter (Plant Mol Biol. 1995 January; 27(2):237-48), more preferably the RCc3 promoter is from rice, further preferably the RCc3 promoter is represented by a nucleic acid sequence substantially similar to SEQ ID NO: 110 or SEQ ID NO: 340, most preferably the promoter is as represented by SEQ ID NO: 110. Examples of other root-specific promoters which may also be used to perform the methods of the invention are shown in Table 2b herein.
- the nucleic acid of (i) may be any of the nucleic acids capable of encoding an AP2-70-like polypeptide as defined herein.
- the nucleic acid is:
- the genetically modified plant cells can be regenerated via all methods with which the skilled worker is familiar. Suitable methods can be found in the abovementioned publications by S. D. Kung and R. Wu, Potrykus or Höfgen and Willmitzer.
- plant cells or cell groupings are selected for the presence of one or more markers which are encoded by plant-expressible genes co-transferred with the gene of interest, following which the transformed material is regenerated into a whole plant.
- the plant material obtained in the transformation is, as a rule, subjected to selective conditions so that transformed plants can be distinguished from untransformed plants.
- the seeds obtained in the above-described manner can be planted and, after an initial growing period, subjected to a suitable selection by spraying.
- a further possibility consists in growing the seeds, if appropriate after sterilization, on agar plates using a suitable selection agent so that only the transformed seeds can grow into plants.
- the transformed plants are screened for the presence of a selectable marker such as the ones described above.
- putatively transformed plants may also be evaluated, for instance using Southern analysis, for the presence of the gene of interest, copy number and/or genomic organisation.
- expression levels of the newly introduced DNA may be monitored using Northern and/or Western analysis, both techniques being well known to persons having ordinary skill in the art.
- the generated transformed plants may be propagated by a variety of means, such as by clonal propagation or classical breeding techniques.
- a first generation (or T1) transformed plant may be selfed and homozygous second-generation (or T2) transformants selected, and the T2 plants may then further be propagated through classical breeding techniques.
- the generated transformed organisms may take a variety of forms. For example, they may be chimeras of transformed cells and non-transformed cells; clonal transformants (e.g., all cells transformed to contain the expression cassette); grafts of transformed and untransformed tissues (e.g., in plants, a transformed rootstock grafted to an untransformed scion).
- the present invention clearly extends to any plant cell or plant produced by any of the methods described herein, and to all plant parts and propagules thereof.
- the present invention extends further to encompass the progeny of a primary transformed or transfected cell, tissue, organ or whole plant that has been produced by any of the aforementioned methods, the only requirement being that progeny exhibit the same genotypic and/or phenotypic characteristic(s) as those produced by the parent in the methods according to the invention.
- the invention also includes host cells containing an isolated nucleic acid encoding a AP2-70-like polypeptide as defined hereinabove.
- Preferred host cells according to the invention are plant cells.
- Host plants for the nucleic acids or the vector used in the method according to the invention, the expression cassette or construct or vector are, in principle, advantageously all plants, which are capable of synthesizing the polypeptides used in the inventive method.
- Plants that are particularly useful in the methods of the invention include all plants which belong to the superfamily Viridiplantae, in particular monocotyledonous and dicotyledonous plants including fodder or forage legumes, ornamental plants, food crops, trees or shrubs.
- the plant is a crop plant.
- crop plants include soybean, sunflower, canola, alfalfa, rapeseed, cotton, tomato, potato and tobacco.
- the plant is a monocotyledonous plant.
- monocotyledonous plants include sugarcane.
- the plant is a cereal. Examples of cereals include rice, maize, wheat, barley, millet, rye, triticale, sorghum and oats.
- the invention also extends to harvestable parts of a plant such as, but not limited to seeds, leaves, fruits, flowers, stems, rhizomes, tubers and bulbs.
- the invention furthermore relates to products derived, preferably directly derived, from a harvestable part of such a plant, such as dry pellets or powders, oil, fat and fatty acids, starch or proteins.
- a preferred method for modulating (preferably, increasing) expression of a nucleic acid encoding an AP2-70-like polypeptide is by introducing and expressing in a plant a nucleic acid encoding an AP2-70-like polypeptide; however the effects of performing the method, i.e. enhancing yield-related traits may also be achieved using other well known techniques. A description of some of these techniques can be found in the “definitions” section.
- T-DNA activation or TILLING (Targeted Induced Local Lesions In Genomes); for a description of the same see the “definitions” section.
- Nucleic acids encoding AP2-70-like polypeptide described herein, or the AP2-70-like polypeptides themselves, may find use in breeding programmes in which a DNA marker is identified which may be genetically linked to an AP2-70-like polypeptide-encoding gene.
- the nucleic acids/genes, or the AP2-70-like polypeptides themselves may be used to define a molecular marker. This DNA or protein marker may then be used in breeding programmes to select plants having enhanced yield-related traits as defined hereinabove in the methods of the invention.
- Southern blots (Sambrook J, Fritsch E F and Maniatis T (1989) Molecular Cloning, A Laboratory Manual) of restriction-digested plant genomic DNA may be probed with the AP2-70-like-encoding nucleic acids. The resulting banding patterns may then be subjected to genetic analyses using computer programs such as MapMaker (Lander et al. (1987) Genomics 1: 174-181) in order to construct a genetic map.
- the nucleic acids may be used to probe Southern blots containing restriction endonuclease-treated genomic DNAs of a set of individuals representing parent and progeny of a defined genetic cross.
- the nucleic acid probes may also be used for physical mapping (i.e., placement of sequences on physical maps; see Hoheisel et al. In: Non-mammalian Genomic Analysis: A Practical Guide, Academic press 1996, pp. 319-346, and references cited therein).
- the nucleic acid probes may be used in direct fluorescence in situ hybridisation (FISH) mapping (Trask (1991) Trends Genet. 7:149-154).
- FISH direct fluorescence in situ hybridisation
- the methods according to the present invention result in plants having enhanced yield-related traits, as described hereinbefore. These traits may also be combined with other economically advantageous traits, such as further yield-enhancing traits, tolerance to other abiotic and biotic stresses, traits modifying various architectural features and/or biochemical and/or physiological features.
- FIG. 1 shows a phylogenetic tree taken from Ooka et al., 2003 (DNA Research 10, 239-247).
- the dashed box 3 rd from the bottom, marked “OsNAC7”, is the group comprising the sequence of SEQ ID NO: 2.
- the cluster of NACs starting from ONAC022 until OsNAC3, represent the cluster comprising the sequences of SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO: 55, SEQ ID NO: 57 and SEQ ID NO: 59.
- Amino acid sequences clustering in these groups (the amino acid sequences given in Tables 3 and 4, for example) are considered to be useful in the methods of the invention.
- FIG. 2 shows the sequence of SEQ ID NO: 132 with (A): Putative nuclear localisation signal, (B): AP2/ERF DNA binding domain, (1): CMVII-1 motif, (3): CMVII-3 motif, (4): CMVII-4 motif, (5): CMVII-5 motif, (6): CMVII-6 motif, (7): CMVII-7 motif, (8): CMVII-8 motif.
- the CMVII motifs were identified according to Nakano et al. (2006).
- FIG. 3 shows a phylogenetic tree taken from Nakano et al. (Plant Physiol. Vol. 140, 2006) in which the group indicated as I(A-6) includes the group of AP2-70-like polypeptides defined herein.
- FIG. 5 shows an alignment of NAC transcription factors as defined hereinabove.
- the sequences were aligned using AlignX program from Vector NTI suite (InforMax, Bethesda, Md.). Multiple alignment was done with a gap opening penalty of 10 and a gap extension of 0.01. Minor manual editing was also carried out where necessary to better position some conserved regions.
- the NAC domain and Motifs I to III are indicated.
- FIG. 6 shows an alignment of NAC transcription factors as defined hereinabove.
- the sequences were aligned using AlignX program from Vector NTI suite (InforMax, Bethesda, Md.). Multiple alignment was done with a gap opening penalty of 10 and a gap extension of 0.01. Minor manual editing was also carried out where necessary to better position some conserved regions.
- the NAC domain and Motifs IV to XI are indicated.
- FIG. 7 shows a CLUSTAL W multiple sequence alignment of AP2-2 polypeptides from Arabidopsis and rice.
- SEQ ID NO: 132 (Os06g09390) is indicated in bold and the conserved regions (motifs XII to XVII, SEQ ID NO: 133 to SEQ ID NO: 138) are underlined.
- FIG. 8 shows an alignment of AP2-70-like polypeptides with Motifs XVIII and XIX indicated and with the AP2 DNA-binding domain also indicated.
- FIG. 9 shows a binary vector p163, for increased expression in Oryza sativa of an Oryza sativa NAC transcription factor-encoding nucleic acid under the control of a GOS2 promoter (internal reference PRO0129).
- FIG. 10 shows a binary vector p164, for increased expression in Oryza saliva of an Oryza saliva NAC1 (SEQ ID NO: 50) transcription factor-encoding nucleic acid under the control of a GOS2 promoter (internal reference PRO0129) for constitutive expression.
- FIG. 11 shows a binary vector p165, for increased expression in Oryza saliva of an Oryza saliva NAC4 (SEQ ID NO: 52) transcription factor-encoding nucleic acid under the control of a GOS2 promoter (internal reference PRO0129) for constitutive expression.
- FIG. 12 shows a binary vector p166, for increased expression in Oryza saliva of an Oryza saliva NAC4 (SEQ ID NO: 52) transcription factor-encoding nucleic acid under the control of an RCc3 promoter (internal reference PRO0110) for root-specific expression.
- FIG. 13 shows a binary vector p167, for increased expression in Oryza sativa of an Oryza sativa NAC transcription factor-encoding nucleic acid under the control of a protochlorophylid reductase promoter (internal reference PRO0123).
- FIG. 14 shows a binary vector p167, for increased expression in Oryza saliva of an Oryza sativa NAC6 (SEQ ID NO: 54) transcription factor-encoding nucleic acid under the control of an RCc3 promoter (internal reference PRO0110) for root-specific expression.
- FIG. 15 shows a binary vector p168, for increased expression in Oryza saliva of an Oryza saliva NAC7 (SEQ ID NO: 56) transcription factor-encoding nucleic acid under the control of a GOS2 promoter (internal reference PRO0129) for constitutive expression.
- FIG. 16 shows a binary vector p169, for increased expression in Oryza saliva of an Oryza saliva NAC3 (SEQ ID NO: 58) transcription factor-encoding nucleic acid under the control of an RCc3 promoter (internal reference PRO0110) for root-specific expression.
- FIG. 17 shows a binary vector pGOS2::NAC1, for increased expression in Oryza saliva of an Oryza sativa NAC1 (SEQ ID NO: 50) transcription factor-encoding nucleic acid under the control of a GOS2 promoter for constitutive expression.
- FIG. 18 shows a binary vector pGOS2::NAC4, for increased expression in Oryza saliva of an Oryza saliva NAC4 (SEQ ID NO: 52) transcription factor-encoding nucleic acid under the control of a GOS2 promoter for constitutive expression.
- FIG. 19 shows a binary vector pRCc3::NAC4, for increased expression in Oryza sativa of an Oryza sativa NAC4 (SEQ ID NO: 52) transcription factor-encoding nucleic acid under the control of an RCc3 promoter for root-specific expression.
- FIG. 20 shows a binary vector pRCc3::NAC6, for increased expression in Oryza saliva of an Oryza saliva NAC6 (SEQ ID NO: 54) transcription factor-encoding nucleic acid under the control of an RCc3 promoter for root-specific expression.
- FIG. 21 shows a binary vector pGOS2::NAC7, for increased expression in Oryza sativa of an Oryza sativa NAC7 (SEQ ID NO: 56) transcription factor-encoding nucleic acid under the control of a GOS2 promoter for constitutive expression.
- FIG. 22 shows a binary vector pRCc3::NAC3, for increased expression in Oryza saliva of an Oryza saliva NAC3 (SEQ ID NO: 58) transcription factor-encoding nucleic acid under the control of an RCc3 promoter for root-specific expression.
- FIG. 23 shows the binary vector for increased expression in Oryza sativa of a rice AP2-2 protein-encoding nucleic acid under the control of a GOS2 promoter.
- FIG. 24 shows the binary vector for increased expression in Oryza saliva of an Oryza sativa AP2-70-like protein-encoding nucleic acid under the control of a rice RCC3 promoter (pRCC3).
- FIG. 25 shows the binary vector for increased expression in Oryza saliva of an Oryza sativa AP2-70-like protein-encoding nucleic acid under the control of a rice GOS2 promoter (pGOS2).
- FIGS. 26 to 29 details examples of sequences useful in performing the methods according to the present invention.
- OsNAM2 cDNA Total cellular RNA from 2-week-old rice seedlings was used to clone OsNAM2 cDNA.
- RNA was extracted using an RNeasy Kit (Qiagen, Germany).
- OsNAM2 cDNA was 1292 bp long, from 5′ UTR (untranslated region) to the stop codon. Two overlapping cDNAs were joined in the OsNAM2 cDNA clone.
- a 5′ cDNA of 1025 bp was obtained by 5′ RACE-PCR using an adapter primer (5′-AAGCAGTGGTATCAACGCAGAGTACGCGGG-3′) and the OsNAM2 specific primer (OsNAM2-2) (5′-CTC TCC AGA GGC GGC ATC ATG TCG GA-3′).
- the 5′ RACE-PCR was performed with the BD SMARTTM RACE cDNA Amplification Kit (Clontech, USA).
- the adapter primer (SMART II A Oligonucleotide) was as provided by the manufacturer.
- the 3′ cDNA of 620 bp was obtained by PCR with two OsNAM2-specific primers (NAM2-1 (5′-TGA TCG GGA TGA GGA AGA C-3′) and NAM2-3 (5′-GAT CAG TCT CGG TCA TCG ATG-3′)).
- the first-stranded cDNA as PCR template was synthesized with the Oligotex mRNA kit (Qiagen, Valencia, Calif.).
- Candidate PCR products were gel-purified, subcloned into the pGEM-T Easy (Promega, USA), and confirmed by sequencing.
- the vector harboring the 5′ cDNA was cut with HindIII and ligated with a HindIII fragment of the 3′ cDNA vector.
- the result was a 1292 bp OsNAM2 cDNA.
- the entry clone was subsequently used in an LR reaction with a destination vector used for Oryza sativa transformation.
- This vector contains as functional elements within the T-DNA borders: a plant selectable marker; a screenable marker expression cassette; and a Gateway cassette intended for LR in vivo recombination with the nucleic acid sequence of interest already cloned in the entry clone.
- a rice GOS2 promoter (SEQ ID NO: 39 or SEQ ID NO: 339) for constitutive expression (internal reference PRO0129) was located upstream of this Gateway cassette.
- the resulting expression vector p163 ( FIG. 9 ) was transformed into Agrobacterium strain LBA4044 and subsequently to Oryza sativa plants. Transformed rice plants were allowed to grow and were then examined for the parameters described below.
- the entry clone was subsequently used in an LR reaction with a destination vector used for Oryza sativa transformation.
- This vector contains as functional elements within the T-DNA borders: a plant selectable marker; a screenable marker expression cassette; and a Gateway cassette intended for LR in vivo recombination with the nucleic acid sequence of interest already cloned in the entry clone.
- a protochlorophylid reductase promoter (SEQ ID NO: 40) for green tissue-specific expression (internal reference PRO0123) was located upstream of this Gateway cassette.
- the resulting expression vector p167 ( FIG. 13 ) was transformed into Agrobacterium strain LBA4044 and subsequently to Oryza sativa plants. Transformed rice plants were allowed to grow and were then examined for the parameters described below.
- T0 rice transformants Approximately 30 independent T0 rice transformants were generated. The primary transformants were transferred from a tissue culture chamber to a greenhouse for growing and harvest of T1 seed. Seven events, of which the T1 progeny segregated 3:1 for presence/absence of the transgene, were retained. For each of these events, approximately 10 T1 seedlings containing the transgene (hetero- and homo-zygotes) and approximately 10 T1 seedlings lacking the transgene (nullizygotes) were selected by monitoring visual marker expression. The transgenic plants and the corresponding nullizygotes were grown side-by-side at random positions. Greenhouse conditions were of shorts days (12 hours light), 28° C. in the light and 22° C. in the dark, and a relative humidity of 70%. From the stage of sowing until the stage of maturity the plants were passed several times through a digital imaging cabinet. At each time point digital images (2048 ⁇ 1536 pixels, 16 million colours) were taken of each plant from at least 6 different angles.
- a two factor ANOVA analysis of variants was used as a statistical model for the overall evaluation of plant phenotypic characteristics.
- An F-test was carried out on all the parameters measured of all the plants of all the events transformed with the gene of the present invention. The F-test was carried out to check for an effect of the gene over all the transformation events and to verify an overall effect of the gene, also known as a global gene effect. The threshold for significance for a true global gene effect was set at a 5% probability level for the F-test.
- a significant F-test value points to a gene effect, meaning that it is not only the mere presence or position of the gene that is causing the differences in phenotype.
- a t-test was performed within each event using data sets from the transgenic plants and the corresponding null plants.
- “Null plants” or “null segregants” or “nullizygotes” are the plants treated in the same way as the transgenic plant, but from which the transgene has segregated. Null plants can also be described as the homozygous negative transformed plants.
- the threshold for significance for the t-test is set at 10% probability level. The results for some events can be above or below this threshold. This is based on the hypothesis that a gene might only have an effect in certain positions in the genome, and that the occurrence of this position-dependent effect is not uncommon.
- This kind of gene effect is also named herein a “line effect of the gene”.
- the p-value is obtained by comparing the t-value to the t-distribution or alternatively, by comparing the F-value to the F-distribution. The p-value then gives the probability that the null hypothesis (i.e., that there is no effect of the transgene) is correct.
- the full-length cDNAs of OsNAC1 and OsNAC3 were obtained from rice EST stocks generated by GreenGene Biotech Inc. These cDNAs were inserted into EcoR1 and Xho1 sites of Bluescript SKII (Stratagene).
- the full-length cDNAs of OsNAC4, OsNAC6 and OsNAC7 were amplified by PCR using as template an Oryza sativa seedling cDNA library (GreenGene Biotech, Korea). After reverse transcription of RNA extracted from 14-day-old seedlings that were treated with 400 mM NaCl for 6 hours, the cDNAs were cloned into Uni-ZAP XR (Stratagene).
- Average insert size of the library was 1.5 kb and original number of plaques was of the order of 1.106 pfu.
- Original titre was determined to be 2.109 pfu/ml after first amplification of 2.106 pfu/ml.
- 0.1 ⁇ g of cDNA library was used in each 50 ⁇ l PCR mixture.
- PCR primers that were used for the amplification of the OsNAC genes are listed in Table 7. PCR amplifications were performed using Pfu DNA polymerase in standard conditions. The DNA fragments were amplified and purified also using standard methods. PCR products were ligated into EcoR1site of pBluescript SKII and sequenced.
- the entry clone was subsequently used in an LR reaction with a destination vector used for Oryza sativa transformation.
- This vector contains as functional elements within the T-DNA borders: a plant selectable marker; a screenable marker expression cassette; and a Gateway cassette intended for LR in vivo recombination with the nucleic acid sequence of interest already cloned in the entry clone.
- a rice GOS2 promoter (SEQ ID NO: 39) for constitutive expression (internal reference PRO0129) was located upstream of this Gateway cassette.
- the resulting expression vectors p164 ( FIG. 10 ), p165 ( FIG. 11 ) and p168 ( FIG. 15 ) were each transformed into Agrobacterium strain LBA4044 and subsequently to Oryza sativa plants. Transformed rice plants were allowed to grow and were then examined for the parameters described below.
- the entry clone was subsequently used in an LR reaction with a destination vector used for Oryza sativa transformation.
- This vector contains as functional elements within the T-DNA borders: a plant selectable marker; a screenable marker expression cassette; and a Gateway cassette intended for LR in vivo recombination with the nucleic acid sequence of interest already cloned in the entry clone.
- a rice RCc3 promoter (SEQ ID NO: 110) for root-specific expression (internal reference PRO0110) was located upstream of this Gateway cassette.
- the resulting expression vector p166 ( FIG. 12 ), p167 ( FIG. 14 ) and p169 ( FIG. 16 ) were each transformed into Agrobacterium strain LBA4044 and subsequently to Oryza sativa plants. Transformed rice plants were allowed to grow and were then examined for the parameters described below.
- T0 rice transformants Approximately 30 independent T0 rice transformants were generated. The primary transformants were transferred from a tissue culture chamber to a greenhouse for growing and harvest of T1 seed. Seven events, of which the T1 progeny segregated 3:1 for presence/absence of the transgene, were retained. For each of these events, approximately 10 T1 seedlings containing the transgene (hetero- and homo-zygotes) and approximately 10 T1 seedlings lacking the transgene (nullizygotes) were selected by monitoring visual marker expression. The transgenic plants and the corresponding nullizygotes were grown side-by-side at random positions. Greenhouse conditions were of shorts days (12 hours light), 28° C. in the light and 22° C. in the dark, and a relative humidity of 70%. From the stage of sowing until the stage of maturity the plants were passed several times through a digital imaging cabinet. At each time point digital images (2048 ⁇ 1536 pixels, 16 million colours) were taken of each plant from at least 6 different angles.
- Plants from five events were grown in potting soil under normal conditions until they approached the heading stage. They were then transferred to a “dry” section where irrigation was withheld. Humidity probes were inserted in randomly chosen pots to monitor the soil water content (SWC). When SWC went below certain thresholds, the plants were automatically re-watered continuously until a normal level was reached again. The plants were then re-transferred again to normal conditions. The rest of the cultivation (plant maturation, seed harvest) was the same as for plants not grown under abiotic stress conditions. A confirmation round was performed consisting of repeating the screen with T2 seeds not harvested from plants of the first drought screen, but from plants grown under normal conditions.
- SWC soil water content
- the plant aboveground area (or leafy biomass) was determined by counting the total number of pixels on the digital images from aboveground plant parts discriminated from the background. This value was averaged for the pictures taken on the same time point from the different angles and was converted to a physical surface value expressed in square mm by calibration. Experiments show that the aboveground plant area measured this way correlates with the biomass of plant parts above ground.
- the Areamax is the above ground area at the time point at which the plant had reached its maximal leafy biomass.
- the mature primary panicles were harvested, bagged, barcode-labelled and then dried for three days in the oven at 37° C.
- the panicles were then threshed and all the seeds collected.
- the filled husks were separated from the empty ones using an air-blowing device. After separation, both seed lots were then counted using a commercially available counting machine. The empty husks were discarded.
- the filled husks were weighed on an analytical balance and the cross-sectional area of the seeds was measured using digital imaging. This procedure resulted in the set of the following seed-related parameters:
- the flowers-per-panicle estimates the average number of florets per panicle on a plant, derived from the number of total seeds divided by the number of first panicles.
- the number of filled seeds was determined by counting the number of filled husks that remained after the separation step.
- the total seed yield (total seed weight) was measured by weighing all filled husks harvested from a plant.
- Total seed number per plant was measured by counting the number of husks harvested from a plant and corresponds to the number of florets per plant.
- Thousand Kernel Weight is extrapolated from the number of filled seeds counted and their total weight.
- Harvest index is defined as the ratio between the total seed weight and the above-ground area (mm 2 ), multiplied by a factor 10 6 .
- the parameter EmerVigor is an indication of the seedling vigour. It is calculated from the area (in mm 2 ) covered by leafy biomass in the first imaging.
- the seed fill rate (fillrate) is an indication of the filling of the seeds. It is expressed as a proportion (in %) of the number of filled seeds over the number of florets (nrtotalseed).
- a two factor ANOVA analysis of variants was used as a statistical model for the overall evaluation of plant phenotypic characteristics.
- An F-test was carried out on all the parameters measured of all the plants of all the events transformed with the gene of the present invention. The F-test was carried out to check for an effect of the gene over all the transformation events and to verify an overall effect of the gene, also known as a global gene effect. The threshold for significance for a true global gene effect was set at a 5% probability level for the F-test.
- a significant F-test value points to a gene effect, meaning that it is not only the mere presence or position of the gene that is causing the differences in phenotype.
- a t-test was performed within each event using data sets from the transgenic plants and the corresponding null plants.
- “Null plants” or “null segregants” or “nullizygotes” are the plants treated in the same way as the transgenic plant, but from which the transgene has segregated. Null plants can also be described as the homozygous negative transformed plants.
- the threshold for significance for the t-test is set at 10% probability level. The results for some events can be above or below this threshold. This is based on the hypothesis that a gene might only have an effect in certain positions in the genome, and that the occurrence of this position-dependent effect is not uncommon.
- This kind of gene effect is also named herein a “line effect of the gene”.
- the p-value was obtained by comparing the t-value to the t-distribution or alternatively, by comparing the F-value to the F-distribution. The p-value then gives the probability that the null hypothesis (i.e., that there is no effect of the transgene) is correct.
- Sequences (full length cDNA, ESTs or genomic) related to SEQ ID NO: 131 and/or protein sequences related to SEQ ID NO: 132 were identified amongst those maintained in the Entrez Nucleotides database at the National Center for Biotechnology Information (NCBI) using database sequence search tools, such as the Basic Local Alignment Tool (BLAST) (Altschul et al. (1990) J. Mol. Biol. 215:403-410; and Altschul et al. (1997) Nucleic Acids Res. 25:3389-3402). The program was used to find regions of local similarity between sequences by comparing nucleic acid or polypeptide sequences to sequence databases and by calculating the statistical significance of matches.
- BLAST Basic Local Alignment Tool
- the polypeptide encoded by SEQ ID NO: 131 was used for the TBLASTN algorithm, with default settings and the filter to ignore low complexity sequences set off.
- the output of the analysis was viewed by pairwise comparison, and ranked according to the probability score (E-value), where the score reflects the probability that a particular alignment occurs by chance (the lower the E-value, the more significant the hit).
- E-value probability score
- comparisons were also scored by percentage identity. Percentage identity refers to the number of identical nucleotides (or amino acids) between the two compared nucleic acid (or polypeptide) sequences over a particular length. In some instances, the default parameters may be adjusted to modify the stringency of the search.
- Table 14 provides a list of nucleic acid and protein sequences related to the nucleic acid sequence as represented by SEQ ID NO: 131 and the protein sequence represented by SEQ ID NO: 132.
- Nucleic acid sequences encoding AP2-2 polypeptides and AP2-2 polypeptides Nucleic acid SEQ ID Poly-peptide Name/identifier
- MatGAT Microx Global Alignment Tool
- MatGAT an application that generates similarity/identity matrices using protein or DNA sequences. Campanella J J, Bitincka L, Smalley J; software hosted by Ledion Bitincka). MatGAT software generates similarity/identity matrices for DNA or protein sequences without needing pre-alignment of the data.
- the program performs a series of pair-wise alignments using the Myers and Miller global alignment algorithm (with a gap opening penalty of 12, and a gap extension penalty of 2), calculates similarity and identity using for example Blosum 62 (for polypeptides), and then places the results in a distance matrix. Sequence similarity is shown in the bottom half of the dividing line and sequence identity is shown in the top half of the diagonal dividing line.
- the percentage identity between the full length polypeptide sequences useful in performing the methods of the invention can be as low as 20% amino acid identity compared to SEQ ID NO: 132.
- the sequence identity will be higher when specific domains, such as the AP2 domain are compared.
- SEQID 144 37.6 55.6 35.5 31.1 30.3 41.1 27.6 25 28.7 29.2 27.7 27.9 27.2 27.5 5.
- SEQID 146 50.6 37.7 48.2 39.5 32 24.9 36.1 33.2 30.7 30.2 34.3 34.3 32.1 32.4 6.
- SEQID 148 74.9 35.2 94.4 35.2 47 25.2 56.5 38.6 87.4 88 36.2 36.2 37.6 37.9 7.
- SEQID 150 31.8 48.1 32.1 52.7 34.1 32.1 23.6 22.2 23.9 24.7 26.3 26.3 24.8 25.3 8.
- SEQID 152 74.8 35.1 69.9 34.2 47.1 69 31.2 42.7 53.5 53.6 39.9 39.9 36.1 36.3 9.
- SEQID 154 54 33.6 51.5 32.6 45.7 51 28 56.1 37.3 36.1 36.8 36.8 35 35.3 10.
- SEQID 156 73.2 33.8 96.1 34.6 46.5 91.3 31.5 67.1 50 85.1 34.8 35.1 35.9 36.3 11.
- SEQID 158 70.7 34.6 89.9 36.1 45.8 90 34 66.6 48 86.8 32.5 32.5 34 34.4 12.
- SEQID 160 53.3 38.5 54.2 35.8 48 52.5 33 53.7 50 53.6 49.2 99.4 62.2 62.8 13.
- SEQID 162 53.3 38.5 54.2 35.8 48 52.5 33 53.7 50 53.6 49.2 100 62.2 62.8 14.
- SEQID 164 56.7 34.3 54.4 33.5 47.2 54.6 29.6 55.4 49.7 54.1 50.1 70.7 71 98.9 15.
- SEQID 166 57.1 34.7 54.7 33.9 47.7 54.9 30.4 55.7 49.7 54.7 50.7 71.7 72 98.9 16.
- SEQID 168 57.2 34.8 54.8 34 47.9 55.1 30.2 55.6 51 54.8 50.8 71.9 72.2 98.7 99.7 17.
- SEQID 170 41.2 47.2 38.9 46.4 41.3 38.4 46.8 38.6 36.9 37.5 38.3 40.8 40.8 39.6 40 18.
- SEQID 172 51.9 34.8 52.1 38.9 52 54.4 32.2 50.4 43.9 49.9 52.9 46.6 46.6 44.3 43.7 19.
- SEQID 174 46.4 34.9 43.4 40.8 51.2 46.7 31.5 48.2 40.9 42.8 44 43.3 43.6 42.2 42.7 20.
- SEQID 176 50 38.6 49.6 40.1 52.7 49 32.8 48.2 44.7 47.6 45.5 48 48 44.6 45.1 21.
- SEQID 178 41.7 46.9 44.5 47.7 47 45 44.3 42.5 39.6 42.5 44.6 45 45.3 39.6 40.3 22.
- SEQID 180 47.5 36.5 40.8 35.9 44.9 42.1 32.8 44.1 38.1 39.4 42.8 46.6 46.6 42.7 42.4 23.
- SEQID 182 32.3 50 32.7 50.7 36.8 33.2 47 32.1 31.1 31.5 32.2 31.8 31.8 32.5 32.8 24.
- SEQID 184 39 55.1 37.2 53.5 43.1 39.8 44.9 37.3 36.9 36.6 39.8 36.3 36.3 34.3 34.7 25.
- SEQID 186 40.6 35.7 42 41.3 50.6 42.1 32 44.4 42.7 42.5 40.7 39.7 39.7 40.1 39.5 26.
- SEQID 188 31.8 37.9 34.1 41.4 39.2 33.8 38.4 32.1 33.1 33 35.8 34.1 34.1 33 33.6 27.
- SEQID 192 39.5 41.2 38 42 38.6 39.8 38 38.9 37.4 36.9 39.5 39.4 39.4 38 39.5 29.
- SEQID 194 53.9 37 54.6 38.2 47.9 55.3 34.9 50.1 46.7 53.2 53.6 57.5 57.5 58.3 57.6 30.
- SEQID 196 44.2 48.8 44.5 51.2 41.3 43.8 49.2 40.5 37.6 41.4 41.9 39.1 39.1 41.2 40 31.
- SEQID 200 56.6 32.8 55.6 37 49.9 55.3 33.3 56.1 52.3 54 51.4 61.5 61.5 62.8 62.8 33.
- SEQID 202 56.6 34.9 57.4 37.6 49.7 57.9 31 60.8 56.8 55.3 53.4 63.8 64 64.1 64.3 34.
- SEQID 204 56.5 34.1 57.6 37.6 49.3 57.6 30.7 60.5 55.1 56.3 53.3 62.7 62.9 62.8 63.5 35.
- SEQID 206 60 34.1 57.9 36.5 50.4 58.9 32.5 57.6 52.5 56.5 53.3 59.5 59.5 59.6 60.3 36.
- SEQID 208 59.1 32.8 56.6 35.2 49.3 57.7 32 56.6 51.3 55.3 52 58.5 58.5 58.6 59.2 37.
- SEQID 210 44.2 48.5 43.4 52.3 42.8 43.3 45.8 42.7 39.6 40.8 42.5 43.6 43.6 41.7 41.3 38.
- SEQID 212 55.4 34.9 51.8 34.6 50 53.3 33.1 57.4 57.6 50 47.7 64.6 64.9 65.6 65.4 39.
- SEQID 214 50.3 37 49.6 38.6 46.1 51.3 37 48.8 44.9 47.3 52.1 54.2 54.5 53.6 54.1 40.
- SEQID 224 39.2 45.9 40.8 45.1 40.4 39.5 45.9 38.9 39.4 39.4 37.7 41.1 41.1 38.8 38.9 45.
- SEQID 228 40.6 43.5 39.4 45.4 41.9 40.1 42.4 40.8 38.9 37.5 39.8 39.1 39.8 40.5 46.
- SEQID 230 58 34.1 53.5 38.1 48 57 32 59.3 59.3 51.7 53.5 64.8 64.8 64.6 64.6 47.
- SEQID 232 56.6 33.9 51.3 36.1 47.4 51.6 31.8 56.1 53.8 52.1 49.2 60.3 60 61.3 61.1 48.
- SEQID 234 56.9 35.1 52.7 35.3 48.1 53.2 31.7 53.8 54.5 50.9 50.6 57.4 57.4 61 61.3 49.
- SEQID 236 55.7 35.2 52.9 35.4 45.8 53.1 33.3 57 56.8 49.7 50.8 55.7 56 59.4 59.1 50.
- SEQID 240 40.6 46.3 42.5 47.2 40.4 41.3 46.3 39.5 36.9 39.4 41.3 39.7 39.7 39.8 40.3 51.
- SEQID 242 42.5 40.7 44.8 43.9 40.7 44.7 43 42.2 37.6 43.1 43.4 44.1 44.1 43 43.7 52.
- SEQID 244 33.4 40.8 29.6 38.3 32.9 32.1 41.7 32.9 27.8 28.7 31.9 35.2 35.5 32.5 32.8 53.
- SEQID 246 46.1 42.6 41.4 47.3 42.8 41.3 41.6 41.6 39.4 41.7 40.4 41.6 41.1 40.6 40.8 54.
- SEQID 248 42.3 46.6 40.6 45.1 42.2 40.7 43.6 37.8 37.9 39.2 39.8 42.2 42.2 41.2 41.1 55.
- SEQID 250 43.4 40.1 44.8 43.2 48.5 45.6 37.7 45.5 42.7 43.7 44.3 43 43 42.5 42.9 56.
- SEQID 252 46.7 38.4 47.3 39.6 60.5 47.9 34.1 47.9 42.4 45.9 48.5 44.7 45.8 42.5 42.9 57.
- SEQID 254 43.4 49.5 44.2 51.6 44.9 43.8 46.2 40.5 40.2 42.5 44 43 43 40.1 40 58.
- SEQID 256 36.2 44.8 38.3 45.6 40.4 39.5 45.2 36.4 36.6 36.3 38.9 38.3 38.3 38 38.7 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1.
- SEQID 132 37.6 29.6 38.3 30.1 34 26.5 29.6 26 27.2 27.9 23.7 41.4 27.7 38.4 32.2 2.
- SEQID 140 27.8 34.1 28.7 27.7 27.6 34.1 26.1 40.3 45.8 28.5 26.6 26.9 32.5 28.7 36.7 3.
- SEQID 142 37.4 28.5 35.2 30.7 32.4 29.1 26.6 25.8 28.2 27.8 23.5 40.1 25.3 36.7 32.8 4.
- SEQID 144 27.5 35.9 30.6 32 31.3 33 29.8 41.6 39.3 31.4 28.8 29.4 30.2 31.2 43.5 5.
- SEQID 146 32.5 29.3 36.3 35.7 37.5 29.5 30.2 27.5 30.3 35.9 27.6 35.4 29.7 35.4 30.3 6.
- SEQID 148 38 28.4 36.9 31.6 32 30.3 26.9 26.9 28.7 29.3 23.5 40.9 26.5 38 33.3 7.
- SEQID 150 25.7 33.3 25.1 24 24.6 31.7 21.8 36.7 31 24.2 26.9 28 28 25.4 38.1 8.
- SEQID 152 36.4 28.3 37.2 32 31.6 30.1 27.9 25.8 28.6 32.2 23.4 42 28.7 37.5 31.1 9.
- SEQID 154 35.7 25.3 31.7 30.1 31 26.2 23.8 24.7 28.8 28.1 23.6 37.8 26.2 33.6 27.5 10.
- SEQID 156 36.4 27.3 33.2 30.2 31.4 27.7 24.6 24.7 24.5 26.2 22.4 39 24.2 35.3 30.5 11.
- SEQID 158 34.5 28 33.7 29.3 28.3 29.1 25.3 25.8 27.8 26.6 23.6 37.1 25.9 34.9 30.1 12.
- SEQID 160 63 28.5 32.4 28 30.2 31.3 27.3 24.9 25.7 27.2 24.9 43.4 29.1 42.9 28.9 13.
- SEQID 162 63 28.5 32.4 28.2 30.2 31 27.3 24.9 25.7 27.2 24.7 43.7 29.1 42.9 28.9 14.
- SEQID 164 98.7 29.3 32.6 27.9 29.9 27.7 26.1 24.5 26.3 27.1 24.1 42.5 27.9 44 29.1 15.
- SEQID 186 39.6 40.7 45 51.2 50.2 39.8 38 33.9 37.9 26.9 29.2 28.5 27.3 26.6 26.
- SEQID 188 33.7 44 33 37.4 36.8 41.6 35.3 37.9 39.5 39.8 23.3 41.3 25.7 25.2 27.
- SEQID 190 61.5 39.2 49.7 44.9 45.2 46.2 45.4 32.5 34.7 43 33.9 27.1 52.8 32.8 28.
- SEQID 192 39.6 43.2 37.1 39.9 39.8 47.7 41.4 40.8 43.6 37.6 56.4 37.4 29.5 26.5 29.
- SEQID 196 41.4 51.2 39.8 41.4 42.2 53.1 39.6 41.5 50.8 38.2 42.7 45.4 44.6 43.4 31.
- SEQID 198 31.6 43.8 33.9 35.2 30.4 42 34 36.3 40.6 33.5 39.5 34.4 41 32.1 41.5 32.
- SEQID 200 62 40.8 47.8 41.3 44.4 44.2 45 32.6 32.6 40.3 33.9 80.4 37.5 73.9 42.4 33.
- SEQID 202 64.3 38.4 47.9 45.8 47.9 44.7 46.6 32.5 36.8 41.3 35.2 71.7 35.2 62.2 44.7 34.
- SEQID 204 63.5 38.1 48.3 45.6 47.5 43.5 45.9 31.7 36 41.1 33.6 71.7 35.7 61.3 45.1 35.
- SEQID 214 54.3 40.8 44.7 43.9 44.1 47.6 41.1 34.5 37 41.9 32.9 58.9 36.7 53.5 48.6 40.
- SEQID 218 38.2 62.5 39.2 39.9 41.6 50.8 44.5 44.4 40.6 37.9 41.8 40.1 42.5 44.3 50.6 42.
- SEQID 220 40.6 59.4 38 38.6 40.1 48.1 40.5 47.3 45.3 38.5 44.1 38.4 43 43.4 50.8 43.
- SEQID 222 34.5 50.8 32.5 30.8 35 42.7 35.9 51 40.7 34.5 44.4 32.5 41.2 38.5 41.9 44.
- SEQID 232 61.8 39.2 46.3 40.8 43.4 43.7 43.4 31.3 35.8 38.4 32.6 67.4 36.8 56.8 42.1 48.
- SEQID 234 61.3 39 43.9 42.3 47 44.2 47.3 32.5 36.1 39 33 63.4 37.7 54.3 42.3 49.
- SEQID 236 59.4 39.6 45.6 44.5 46.9 43.2 41.9 33.3 37 39.1 33.6 63.5 35.4 53.1 41.9 50.
- SEQID 240 40.4 94.4 39.8 40.2 42.9 44.7 40.5 45.9 50 37.6 43.1 41.1 42 43.4 51.9 51.
- SEQID 252 43.9 40.9 47.7 45.4 51.4 46 43.9 36.6 40.2 45.7 35.4 46.8 39.9 46.6 41.8 57.
- SEQID 154 40.4 55.7 41.8 44.2 43.2 52 41.1 41 46.9 38.2 38.5 45.2 42.9 42.8 63.7 58.
- SEQID 156 39.3 58.3 37.4 38.6 41.3 46.2 40.8 44 46 40.4 40.9 36.8 42.5 42.8 50 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 1.
- SEQID 132 20.3 41.3 41.2 41 40.3 39.4 31.4 42 34.5 38.4 26.8 29.5 24.2 28.2 27 2.
- SEQID 140 24 25.8 27 26.4 25.1 26.3 36.6 26.9 26.8 25.5 33.1 33.3 35.4 33.1 33.7 3.
- SEQID 142 21.5 40.3 41.2 40.5 38.7 37 29.9 38.4 34.3 35.7 26.3 28 24 27.9 26.2 4.
- SEQID 144 24.1 30.1 30.4 30.2 28.9 28.5 42.8 27.8 29.4 27.3 34.2 37.5 33.9 37 34.8 5.
- SEQID 146 21.5 36.8 34.5 33.8 36.9 36.2 29.7 35 29.4 34.9 29.3 29.1 25.1 28.3 27.8 6.
- SEQID 156 21.3 39.5 39.9 39.5 38.5 36.8 28 36.9 32.5 34.6 25.8 26.2 22.6 27.6 25.1 11.
- SEQID 158 23.7 38.1 40 38.8 36.8 35.1 29.6 35.4 35.7 34.2 25.7 26.8 22.7 26.5 26.5 12.
- SEQID 160 23.2 47.2 48.8 47.9 44.3 43.6 32.2 52.1 39.1 46.6 28.4 30.7 25.4 30.1 28.4 13.
- SEQID 174 23.5 26.9 30.2 29.9 28.3 27.8 28.4 28 24.9 27.8 25 25.9 22 27.9 24.9 20.
- SEQID 176 19 30.4 31.2 31.3 29.7 29.8 28.5 30.1 25.9 30.3 25.2 26.7 23.1 28 25.8 21.
- SEQID 180 20.5 27.9 29.8 29.2 27.6 28.3 24.8 27.3 22.1 25.2 27.2 26.4 23 26.1 25.8 23.
- SEQID 192 26.7 26.7 25.2 25.2 26.5 27.2 27.1 26.1 23.5 27 27.4 29.1 27.9 28.4 27 29.
- SEQID 194 21.3 68.5 48.7 48.3 54.5 55.4 31.7 44.9 35.9 44.2 30.4 31.6 28.4 31.3 30.7 30.
- SEQID 196 21.9 32.3 32.5 32.7 35.2 34 72.7 32.3 34.2 28.9 32.3 33.9 28.7 33 32.9 31.
- SEQID 198 20.9 18.9 18.8 20.2 20.5 23 22.1 21 20.9 24.3 24.4 26.5 24.9 25.3 32.
- SEQID 200 31.5 59.9 59.5 69.4 67.4 32.3 55.1 45.4 52.9 28.1 28.8 23.5 28.5 27.3 33.
- SEQID 202 30.7 72.9 96.3 56.1 55.1 33.2 66.1 54 58.6 30.5 28.5 24.1 28.9 30.7 34.
- SEQID 204 30.7 71.8 97.1 55.8 54.7 33.5 65.1 53 57.1 29.7 28.9 24.3 27.7 30.4 35.
- SEQID 206 32 81.1 72.2 72 97.3 34.4 53.5 45.8 49.5 28.8 28.9 25.3 27.2 28.8 36.
- SEQID 230 31.5 72.1 79.5 76.9 70.1 68 44.4 77.7 65.1 70.5 39.6 39.1 34.4 36.5 40.9 47.
- SEQID 232 30.5 68.2 74.5 72.9 68.2 66.3 42.4 74.1 62.6 65.4 38.4 40.5 31.6 38.9 40.5 48.
- SEQID 240 42.6 39.5 38.4 38.7 42.4 42.3 54.5 37.2 40.4 36.4 61.3 58.2 52 60.8 63.4 51.
- SEQID 242 36.1 47.3 45.5 45.3 46.7 46.6 59 46.9 46.7 43.4 45.6 45.9 37 45.2 45.6 52.
- SEQID 244 40.2 32.6 31 31.2 33.9 33.9 42.8 31.5 35.1 31.1 42.9 43.8 40.8 42.4 40.8 53.
- SEQID 246 39.3 42.9 44.4 44.5 47.5 47.4 75.5 46.7 51.4 42.9 43.3 47 37.9 46.3 45 54.
- SEQID 248 40.2 42.9 40.2 39.5 41.3 40.7 55.3 40.3 44.2 37.4 56.1 62.1 49.2 61.4 58 55.
- SEQID 250 34.3 46.8 45.2 46.9 46.9 46.3 55.6 46.7 47.4 43.4 43.2 43.8 34 41.9 42.6 56.
- SEQID 252 36 43.7 45.8 43.2 45.1 45 40.9 41.5 43 43.4 38.7 39 29.9 39.9 36.6 57.
- SEQID 254 39.9 42.9 45.5 45.1 46.1 45.5 64.1 44.4 47 43.2 48 49.1 38.5 48 48.7 58.
- SEQID 132 41 41.4 40.8 41.6 28.6 29.8 21.5 33.4 27.9 32.1 33.3 31.5 26.6 2.
- SEQID 140 28.1 27.1 26.8 27 36.4 31.3 26.8 31.8 36.4 31.1 28.4 37.8 33.2 3.
- SEQID 142 38.8 38.3 38.6 36.2 30.3 30.5 20.2 27.2 29 30.2 31.3 32.4 26.8 4.
- SEQID 144 31.3 28.4 29.2 31.1 35.1 33.7 23.5 37.8 34.6 35 30.5 43.8 36.2 5.
- SEQID 148 43.4 39.7 39.8 37.9 29.5 32.2 21.5 29.4 28.9 30.3 31 34.5 26.7 7.
- SEQID 150 26.2 25 24.9 25.3 33.2 33.7 29.1 34.1 35.1 31 25.5 37.7 35.7 8.
- SEQID 152 45.3 42.4 40.8 39.5 28.3 30.4 22.1 28.6 28.1 30.7 35.7 31 25.4 9.
- SEQID 154 43.1 37.4 36.8 39.7 26 27.8 19.8 27.1 27.3 30.6 30.2 28.7 27.8 10.
- SEQID 156 39.2 37.9 37.5 34.5 28.7 27.7 19.9 27.4 27 29.1 28.8 30.8 26.8 11.
- SEQID 158 40.9 37 38.6 37 29.5 29.8 21.1 27 27.4 29.2 31 32.9 26.5 12.
- SEQID 160 49.3 46.3 44.8 44.4 28.3 30.8 24.1 29.9 29.7 29.3 31.1 32.2 27 13.
- SEQID 162 49.3 46 45.1 44.4 28.3 30.8 24.4 29.1 30 29.3 31.6 32.5 27 14.
- SEQID 164 46.6 42.3 43.2 42.6 29.7 31 22.6 28.3 29.2 29.9 30.6 29.8 28.8 15.
- SEQID 166 47.1 42.7 43.6 42.8 30.1 31.8 21.8 28.8 29.3 30.2 30.8 29.6 28.8 16.
- SEQID 178 35.5 33.3 31.4 32.2 31.2 28.9 26.6 30.1 31.4 29.3 30 35 30.6 22.
- SEQID 180 28.2 26.4 29.6 29 26.7 27.1 19.6 24.1 25.7 24.1 27.4 26.8 27.5 23.
- SEQID 182 24.1 24.5 25.7 26.8 36.2 28.9 23.6 27 33 28 27.7 33.3 35.2 24.
- SEQID 186 30 28.3 27 29 28.2 25.4 22.6 25.6 25.8 28 32.4 26.9 28.3 26.
- SEQID 198 18.9 19.2 19.9 19.9 23.7 20 24.9 21.4 22.5 23.7 22.8 22.1 25.1 32.
- SEQID 200 57.4 55.4 48.4 46.9 30.1 35.5 22.1 32.4 31.5 34.5 32 34.5 29.7 33.
- SEQID 202 67.1 59.2 53.5 54.4 28.6 33.8 20.4 31.5 30.3 33.2 31.1 35 31 34.
- SEQID 208 50.3 47.8 44.2 44.2 29.6 34.8 22.4 32.7 28.9 33.4 30.6 36 28.7 37.
- SEQID 212 63.7 57 49.9 52.2 28 34 22.3 31.6 28.4 33.8 31.2 34.3 29.6 39.
- SEQID 242 45.4 42.4 46 43.8 45.9 22.3 41.3 33.2 41.7 25.4 52.8 31.3 52.
- SEQID 248 44.6 40 39.5 40.9 60.2 47.2 39.4 48.7 30.5 29.3 33.2 39.9 55.
- SEQID 250 44.9 48.7 44.9 47.1 44.4 53.8 33.7 56.5 42.9 29.2 46.7 30.2 56.
- the Integrated Resource of Protein Families, Domains and Sites (InterPro) database is an integrated interface for the commonly used signature databases for text- and sequence-based searches.
- the InterPro database combines these databases, which use different methodologies and varying degrees of biological information about well-characterized proteins to derive protein signatures.
- Collaborating databases include SWISS-PROT, PROSITE, TrEMBL, PRINTS, ProDom and Pfam, Smart and TIGRFAMs.
- Interpro is hosted at the European Bioinformatics Institute in the United Kingdom.
- TargetP 1.1 predicts the subcellular location of eukaryotic proteins. The location assignment is based on the predicted presence of any of the N-terminal pre-sequences: chloroplast transit peptide (cTP), mitochondrial targeting peptide (mTP) or secretory pathway signal peptide (SP). Scores on which the final prediction is based are not really probabilities, and they do not necessarily add to one. However, the location with the highest score is the most likely according to TargetP, and the relationship between the scores (the reliability class) may be an indication of how certain the prediction is. The reliability class (RC) ranges from 1 to 5, where 1 indicates the strongest prediction. TargetP is maintained at the server of the Technical University of Denmark.
- a potential cleavage site can also be predicted.
- a number of parameters were selected, such as organism group (non-plant or plant), cutoff sets (none, predefined set of cutoffs, or user-specified set of cutoffs), and the calculation of prediction of cleavage sites (yes or no).
- TargetP 1.1 analysis of the polypeptide sequence as represented by SEQ ID NO: 132 are presented Table 17.
- the “plant” organism group has been selected, no cutoffs defined, and the predicted length of the transit peptide requested.
- the subcellular localization of the polypeptide sequence as represented by SEQ ID NO: 132 may be the cytoplasm or nucleus, no transit peptide is predicted.
- TargetP 1.1 analysis of the polypeptide sequence as represented by SEQ ID NO: 132 Length (AA) 130 Chloroplastic transit peptide 0.098 Mitochondrial transit peptide 0.339 Secretory pathway signal peptide 0.035 Other subcellular targeting 0.797 Predicted Location / Reliability class 3 Predicted transit peptide length /
- the Oryza sativa AP2-2 gene was amplified by PCR from a rice cDNA library.
- the PCR fragment of the expected length was purified and subsequently cloned in a Gateway® vector using standard technology.
- the entry clone comprising SEQ ID NO: 131 was then used in an LR reaction with a destination vector used for Oryza sativa transformation.
- This vector contained as functional elements within the T-DNA borders: a plant selectable marker; a screenable marker expression cassette; and a Gateway cassette intended for LR in vivo recombination with the nucleic acid sequence of interest already cloned in the entry clone.
- a rice GOS2 promoter (SEQ ID NO: 39) for root specific expression was located upstream of this Gateway cassette.
- the resulting expression vector pGOS2::AP2-2 ( FIG. 23 ) was transformed into Agrobacterium strain LBA4044 according to methods well known in the art.
- the Agrobacterium containing the expression vector was used to transform Oryza sativa plants. Mature dry seeds of the rice japonica cultivar Nipponbare were dehusked. Sterilization was carried out by incubating for one minute in 70% ethanol, followed by 30 minutes in 0.2% HgCl 2 , followed by a 6 times 15 minutes wash with sterile distilled water. The sterile seeds were then germinated on a medium containing 2,4-D (callus induction medium). After incubation in the dark for four weeks, embryogenic, scutellum-derived calli were excised and propagated on the same medium. After two weeks, the calli were multiplied or propagated by subculture on the same medium for another 2 weeks. Embryogenic callus pieces were sub-cultured on fresh medium 3 days before co-cultivation (to boost cell division activity).
- Agrobacterium strain LBA4404 containing the expression vector was used for co-cultivation.
- Agrobacterium was inoculated on AB medium with the appropriate antibiotics and cultured for 3 days at 28° C.
- the bacteria were then collected and suspended in liquid co-cultivation medium to a density (OD 600 ) of about 1.
- the suspension was then transferred to a Petri dish and the calli immersed in the suspension for 15 minutes.
- the callus tissues were then blotted dry on a filter paper and transferred to solidified, co-cultivation medium and incubated for 3 days in the dark at 25° C.
- Co-cultivated calli were grown on 2,4-D-containing medium for 4 weeks in the dark at 28° C. in the presence of a selection agent.
- T0 rice transformants Approximately 35 independent T0 rice transformants were generated for one construct. The primary transformants were transferred from a tissue culture chamber to a greenhouse. After a quantitative PCR analysis to verify copy number of the T-DNA insert, only single copy transgenic plants that exhibit tolerance to the selection agent were kept for harvest of T1 seed. Seeds were then harvested three to five months after transplanting. The method yielded single locus transformants at a rate of over 50% (Aldemita and Hodges 1996, Chan et al. 1993, Hiei et al. 1994).
- Transformation of maize ( Zea mays ) is performed with a modification of the method described by Ishida et al. (1996) Nature Biotech 14(6): 745-50. Transformation is genotype-dependent in corn and only specific genotypes are amenable to transformation and regeneration.
- the inbred line A188 (University of Minnesota) or hybrids with A188 as a parent are good sources of donor material for transformation, but other genotypes can be used successfully as well.
- Ears are harvested from corn plant approximately 11 days after pollination (DAP) when the length of the immature embryo is about 1 to 1.2 mm. Immature embryos are cocultivated with Agrobacterium tumefaciens containing the expression vector, and transgenic plants are recovered through organogenesis.
- Excised embryos are grown on callus induction medium, then maize regeneration medium, containing the selection agent (for example imidazolinone but various selection markers can be used).
- the Petri plates are incubated in the light at 25° C. for 2-3 weeks, or until shoots develop.
- the green shoots are transferred from each embryo to maize rooting medium and incubated at 25° C. for 2-3 weeks, until roots develop.
- the rooted shoots are transplanted to soil in the greenhouse.
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- Transformation of wheat is performed with the method described by Ishida et al. (1996) Nature Biotech 14(6): 745-50.
- the cultivar Bobwhite (available from CIMMYT, Mexico) is commonly used in transformation.
- Immature embryos are co-cultivated with Agrobacterium tumefaciens containing the expression vector, and transgenic plants are recovered through organogenesis. After incubation with Agrobacterium, the embryos are grown in vitro on callus induction medium, then regeneration medium, containing the selection agent (for example imidazolinone but various selection markers can be used).
- the Petri plates are incubated in the light at 25° C. for 2-3 weeks, or until shoots develop.
- the green shoots are transferred from each embryo to rooting medium and incubated at 25° C. for 2-3 weeks, until roots develop.
- the rooted shoots are transplanted to soil in the greenhouse.
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert
- Soybean is transformed according to a modification of the method described in the Texas A&M U.S. Pat. No. 5,164,310.
- Several commercial soybean varieties are amenable to transformation by this method.
- the cultivar Jack (available from the Illinois Seed foundation) is commonly used for transformation. Soybean seeds are sterilised for in vitro sowing. The hypocotyl, the radicle and one cotyledon are excised from seven-day old young seedlings. The epicotyl and the remaining cotyledon are further grown to develop axillary nodes. These axillary nodes are excised and incubated with Agrobacterium tumefaciens containing the expression vector.
- the explants are washed and transferred to selection media.
- Regenerated shoots are excised and placed on a shoot elongation medium. Shoots no longer than 1 cm are placed on rooting medium until roots develop.
- the rooted shoots are transplanted to soil in the greenhouse.
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- Cotyledonary petioles and hypocotyls of 5-6 day old young seedling are used as explants for tissue culture and transformed according to Babic et al. (1998, Plant Cell Rep 17: 183-188).
- the commercial cultivar Westar (Agriculture Canada) is the standard variety used for transformation, but other varieties can also be used.
- Canola seeds are surface-sterilized for in vitro sowing.
- the cotyledon petiole explants with the cotyledon attached are excised from the in vitro seedlings, and inoculated with Agrobacterium (containing the expression vector) by dipping the cut end of the petiole explant into the bacterial suspension.
- the explants are then cultured for 2 days on MSBAP-3 medium containing 3 mg/l BAP, 3% sucrose, 0.7% Phytagar at 23° C., 16 hr light.
- the petiole explants are transferred to MSBAP-3 medium containing 3 mg/l BAP, cefotaxime, carbenicillin, or timentin (300 mg/l) for 7 days, and then cultured on MSBAP-3 medium with cefotaxime, carbenicillin, or timentin and selection agent until shoot regeneration.
- the shoots are 5-10 mm in length, they are cut and transferred to shoot elongation medium (MSBAP-0.5, containing 0.5 mg/l BAP).
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- a regenerating clone of alfalfa ( Medicago sativa ) is transformed using the method of (McKersie et al., 1999 Plant Physiol 119: 839-847). Regeneration and transformation of alfalfa is genotype dependent and therefore a regenerating plant is required. Methods to obtain regenerating plants have been described. For example, these can be selected from the cultivar Rangelander (Agriculture Canada) or any other commercial alfalfa variety as described by Brown D C W and A Atanassov (1985. Plant Cell Tissue Organ Culture 4: 111-112).
- the RA3 variety has been selected for use in tissue culture (Walker et al., 1978 ⁇ m J Bot 65:654-659). Petiole explants are cocultivated with an overnight culture of Agrobacterium tumefaciens C58C1 pMP90 (McKersie et al., 1999 Plant Physiol 119: 839-847) or LBA4404 containing the expression vector. The explants are cocultivated for 3 d in the dark on SH induction medium containing 288 mg/L Pro, 53 mg/L thioproline, 4.35 g/L K2SO4, and 100 ⁇ m acetosyringinone.
- the explants are washed in half-strength Murashige-Skoog medium (Murashige and Skoog, 1962) and plated on the same SH induction medium without acetosyringinone but with a suitable selection agent and suitable antibiotic to inhibit Agrobacterium growth. After several weeks, somatic embryos are transferred to BOi2Y development medium containing no growth regulators, no antibiotics, and 50 g/L sucrose. Somatic embryos are subsequently germinated on half-strength Murashige-Skoog medium. Rooted seedlings were transplanted into pots and grown in a greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- T0 rice transformants Approximately 35 independent T0 rice transformants were generated. The primary transformants were transferred from a tissue culture chamber to a greenhouse for growing and harvest of T1 seed. Six events, of which the T1 progeny segregated 3:1 for presence/absence of the transgene, were retained. For each of these events, approximately 10 T1 seedlings containing the transgene (hetero- and homo-zygotes) and approximately 10 T1 seedlings lacking the transgene (nullizygotes) were selected by monitoring visual marker expression. The transgenic plants and the corresponding nullizygotes were grown side-by-side at random positions. Greenhouse conditions were of shorts days (12 hours light), 28° C. in the light and 22° C. in the dark, and a relative humidity of 70%.
- a two factor ANOVA analysis of variants was used as a statistical model for the overall evaluation of plant phenotypic characteristics.
- An F-test was carried out on all the parameters measured of all the plants of all the events transformed with the gene of the present invention. The F-test was carried out to check for an effect of the gene over all the transformation events and to verify for an overall effect of the gene, also known as a global gene effect.
- the threshold for significance for a true global gene effect was set at a 5% probability level for the F-test.
- a significant F-test value points to a gene effect, meaning that it is not only the mere presence or position of the gene that is causing the differences in phenotype.
- the plant aboveground area (or leafy biomass) was determined by counting the total number of pixels on the digital images from aboveground plant parts discriminated from the background. This value was averaged for the pictures taken on the same time point from the different angles and was converted to a physical surface value expressed in square mm by calibration. Experiments show that the aboveground plant area measured this way correlates with the biomass of plant parts above ground.
- the above ground area is the area measured at the time point at which the plant had reached its maximal leafy biomass.
- the early vigour is the plant (seedling) aboveground area three weeks post-germination.
- Increase in root biomass is expressed as an increase in total root biomass (measured as maximum biomass of roots observed during the lifespan of a plant); or as an increase in the root/shoot index (measured as the ratio between root mass and shoot mass in the period of active growth of root and shoot).
- the mature primary panicles were harvested, counted, bagged, barcode-labelled and then dried for three days in an oven at 37° C. The panicles were then threshed and all the seeds were collected and counted.
- the filled husks were separated from the empty ones using an air-blowing device. The empty husks were discarded and the remaining fraction was counted again.
- the filled husks were weighed on an analytical balance. The number of filled seeds was determined by counting the number of filled husks that remained after the separation step. The total seed yield was measured by weighing all filled husks harvested from a plant. Total seed number per plant was measured by counting the number of husks harvested from a plant.
- Thousand Kernel Weight is extrapolated from the number of filled seeds counted and their total weight.
- the Harvest Index (HI) in the present invention is defined as the ratio between the total seed yield and the above ground area (mm 2 ), multiplied by a factor 10 6 .
- the total number of flowers per panicle as defined in the present invention is the ratio between the total number of seeds and the number of mature primary panicles.
- the seed fill rate as defined in the present invention is the proportion (expressed as a %) of the number of filled seeds over the total number of seeds (or florets).
- Sequences (full length cDNA, ESTs or genomic) related to SEQ ID NO: 257 and/or protein sequences related to SEQ ID NO: 258 were identified amongst those maintained in the Entrez Nucleotides database at the National Center for Biotechnology Information (NCBI) using database sequence search tools, such as the Basic Local Alignment Tool (BLAST) (Altschul et al. (1990) J. Mol. Biol. 215:403-410; and Altschul et al. (1997) Nucleic Acids Res. 25:3389-3402). The program was used to find regions of local similarity between sequences by comparing nucleic acid or polypeptide sequences to sequence databases and by calculating the statistical significance of matches.
- BLAST Basic Local Alignment Tool
- the polypeptide encoded by SEQ ID NO: 257 was used for the TBLASTN algorithm, with default settings and the filter to ignore low complexity sequences set off.
- the output of the analysis was viewed by pairwise comparison, and ranked according to the probability score (E-value), where the score reflects the probability that a particular alignment occurs by chance (the lower the E-value, the more significant the hit).
- E-value probability score
- comparisons were also scored by percentage identity. Percentage identity refers to the number of identical nucleotides (or amino acids) between the two compared nucleic acid (or polypeptide) sequences over a particular length. In some instances, the default parameters may be adjusted to modify the stringency of the search.
- Table 18 provides a list of nucleic acid and protein sequences related to the nucleic acid sequence as represented by SEQ ID NO: 257 and the protein sequence represented by SEQ ID NO: 258.
- the resulting expression vector pGOS2::AP2-70 ( FIG. 25 ) was transformed into Agrobacterium strain LBA4044 according to methods well known in the art.
- the Agrobacterium containing the expression vector was used to transform Oryza sativa plants. Mature dry seeds of the rice japonica cultivar Nipponbare were dehusked. Sterilization was carried out by incubating for one minute in 70% ethanol, followed by 30 minutes in 0.2% HgCl 2 , followed by a 6 times 15 minutes wash with sterile distilled water. The sterile seeds were then germinated on a medium containing 2,4-D (callus induction medium). After incubation in the dark for four weeks, embryogenic, scutellum-derived calli were excised and propagated on the same medium. After two weeks, the calli were multiplied or propagated by subculture on the same medium for another 2 weeks. Embryogenic callus pieces were sub-cultured on fresh medium 3 days before co-cultivation (to boost cell division activity).
- Agrobacterium strain LBA4404 containing the expression vector was used for co-cultivation.
- Agrobacterium was inoculated on AB medium with the appropriate antibiotics and cultured for 3 days at 28° C.
- the bacteria were then collected and suspended in liquid co-cultivation medium to a density (OD 600 ) of about 1.
- the suspension was then transferred to a Petri dish and the calli immersed in the suspension for 15 minutes.
- the callus tissues were then blotted dry on a filter paper and transferred to solidified, co-cultivation medium and incubated for 3 days in the dark at 25° C.
- Co-cultivated calli were grown on 2,4-D-containing medium for 4 weeks in the dark at 28° C. in the presence of a selection agent.
- T0 rice transformants Approximately 35 independent T0 rice transformants were generated for one construct. The primary transformants were transferred from a tissue culture chamber to a greenhouse. After a quantitative PCR analysis to verify copy number of the T-DNA insert, only single copy transgenic plants that exhibit tolerance to the selection agent were kept for harvest of T1 seed. Seeds were then harvested three to five months after transplanting. The method yielded single locus transformants at a rate of over 50% (Aldemita and Hodges 1996, Chan et al. 1993, Hiei et al. 1994).
- Transformation of maize ( Zea mays ) is performed with a modification of the method described by Ishida et al. (1996) Nature Biotech 14(6): 745-50. Transformation is genotype-dependent in corn and only specific genotypes are amenable to transformation and regeneration.
- the inbred line A188 (University of Minnesota) or hybrids with A188 as a parent are good sources of donor material for transformation, but other genotypes can be used successfully as well.
- Ears are harvested from corn plant approximately 11 days after pollination (DAP) when the length of the immature embryo is about 1 to 1.2 mm. Immature embryos are cocultivated with Agrobacterium tumefaciens containing the expression vector, and transgenic plants are recovered through organogenesis.
- Excised embryos are grown on callus induction medium, then maize regeneration medium, containing the selection agent (for example imidazolinone but various selection markers can be used).
- the Petri plates are incubated in the light at 25° C. for 2-3 weeks, or until shoots develop.
- the green shoots are transferred from each embryo to maize rooting medium and incubated at 25° C. for 2-3 weeks, until roots develop.
- the rooted shoots are transplanted to soil in the greenhouse.
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- Transformation of wheat is performed with the method described by Ishida et al. (1996) Nature Biotech 14(6): 745-50.
- the cultivar Bobwhite (available from CIMMYT, Mexico) is commonly used in transformation.
- Immature embryos are co-cultivated with Agrobacterium tumefaciens containing the expression vector, and transgenic plants are recovered through organogenesis. After incubation with Agrobacterium, the embryos are grown in vitro on callus induction medium, then regeneration medium, containing the selection agent (for example imidazolinone but various selection markers can be used).
- the Petri plates are incubated in the light at 25° C. for 2-3 weeks, or until shoots develop.
- the green shoots are transferred from each embryo to rooting medium and incubated at 25° C. for 2-3 weeks, until roots develop.
- the rooted shoots are transplanted to soil in the greenhouse.
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert
- Soybean is transformed according to a modification of the method described in the Texas A&M U.S. Pat. No. 5,164,310.
- Several commercial soybean varieties are amenable to transformation by this method.
- the cultivar Jack (available from the Illinois Seed foundation) is commonly used for transformation. Soybean seeds are sterilised for in vitro sowing. The hypocotyl, the radicle and one cotyledon are excised from seven-day old young seedlings. The epicotyl and the remaining cotyledon are further grown to develop axillary nodes. These axillary nodes are excised and incubated with Agrobacterium tumefaciens containing the expression vector.
- the explants are washed and transferred to selection media.
- Regenerated shoots are excised and placed on a shoot elongation medium. Shoots no longer than 1 cm are placed on rooting medium until roots develop.
- the rooted shoots are transplanted to soil in the greenhouse.
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- Cotyledonary petioles and hypocotyls of 5-6 day old young seedling are used as explants for tissue culture and transformed according to Babic et al. (1998, Plant Cell Rep 17: 183-188).
- the commercial cultivar Westar (Agriculture Canada) is the standard variety used for transformation, but other varieties can also be used.
- Canola seeds are surface-sterilized for in vitro sowing.
- the cotyledon petiole explants with the cotyledon attached are excised from the in vitro seedlings, and inoculated with Agrobacterium (containing the expression vector) by dipping the cut end of the petiole explant into the bacterial suspension.
- the explants are then cultured for 2 days on MSBAP-3 medium containing 3 mg/l BAP, 3% sucrose, 0.7% Phytagar at 23° C., 16 hr light.
- the petiole explants are transferred to MSBAP-3 medium containing 3 mg/l BAP, cefotaxime, carbenicillin, or timentin (300 mg/l) for 7 days, and then cultured on MSBAP-3 medium with cefotaxime, carbenicillin, or timentin and selection agent until shoot regeneration.
- the shoots are 5-10 mm in length, they are cut and transferred to shoot elongation medium (MSBAP-0.5, containing 0.5 mg/l BAP).
- T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- a regenerating clone of alfalfa (Medicago sativa) is transformed using the method of (McKersie et al., 1999 Plant Physiol 119: 839-847). Regeneration and transformation of alfalfa is genotype dependent and therefore a regenerating plant is required. Methods to obtain regenerating plants have been described. For example, these can be selected from the cultivar Rangelander (Agriculture Canada) or any other commercial alfalfa variety as described by Brown D C W and A Atanassov (1985. Plant Cell Tissue Organ Culture 4: 111-112).
- the RA3 variety has been selected for use in tissue culture (Walker et al., 1978 ⁇ m J Bot 65:654-659). Petiole explants are cocultivated with an overnight culture of Agrobacterium tumefaciens C58C1 pMP90 (McKersie et al., 1999 Plant Physiol 119: 839-847) or LBA4404 containing the expression vector. The explants are cocultivated for 3 d in the dark on SH induction medium containing 288 mg/L Pro, 53 mg/L thioproline, 4.35 g/L K2S04, and 100 ⁇ m acetosyringinone.
- the explants are washed in half-strength Murashige-Skoog medium (Murashige and Skoog, 1962) and plated on the same SH induction medium without acetosyringinone but with a suitable selection agent and suitable antibiotic to inhibit Agrobacterium growth. After several weeks, somatic embryos are transferred to BOi2Y development medium containing no growth regulators, no antibiotics, and 50 g/L sucrose. Somatic embryos are subsequently germinated on half-strength Murashige-Skoog medium. Rooted seedlings were transplanted into pots and grown in a greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.
- T0 rice transformants Approximately 35 independent T0 rice transformants were generated. The primary transformants were transferred from a tissue culture chamber to a greenhouse for growing and harvest of T1 seed. Six events, of which the T1 progeny segregated 3:1 for presence/absence of the transgene, were retained. For each of these events, approximately 10 T1 seedlings containing the transgene (hetero- and homo-zygotes) and approximately 10 T1 seedlings lacking the transgene (nullizygotes) were selected by monitoring visual marker expression. The transgenic plants and the corresponding nullizygotes were grown side-by-side at random positions. Greenhouse conditions were of shorts days (12 hours light), 28° C. in the light and 22° C. in the dark, and a relative humidity of 70%.
- T1 events were further evaluated in the T2 generation following the same evaluation procedure as for the T1 generation but with more individuals per event. From the stage of sowing until the stage of maturity the plants were passed several times through a digital imaging cabinet. At each time point digital images (2048 ⁇ 1536 pixels, 16 million colours) were taken of each plant from at least 6 different angles.
- a two factor ANOVA analysis of variants was used as a statistical model for the overall evaluation of plant phenotypic characteristics.
- An F-test was carried out on all the parameters measured of all the plants of all the events transformed with the gene of the present invention. The F-test was carried out to check for an effect of the gene over all the transformation events and to verify for an overall effect of the gene, also known as a global gene effect.
- the threshold for significance for a true global gene effect was set at a 5% probability level for the F-test.
- a significant F-test value points to a gene effect, meaning that it is not only the mere presence or position of the gene that is causing the differences in phenotype.
- the plant aboveground area (or leafy biomass) was determined by counting the total number of pixels on the digital images from aboveground plant parts discriminated from the background. This value was averaged for the pictures taken on the same time point from the different angles and was converted to a physical surface value expressed in square mm by calibration. Experiments show that the aboveground plant area measured this way correlates with the biomass of plant parts above ground.
- the above ground area is the area measured at the time point at which the plant had reached its maximal leafy biomass.
- the early vigour is the plant (seedling) aboveground area three weeks post-germination.
- Increase in root biomass is expressed as an increase in total root biomass (measured as maximum biomass of roots observed during the lifespan of a plant); or as an increase in the root/shoot index (measured as the ratio between root mass and shoot mass in the period of active growth of root and shoot).
- the mature primary panicles were harvested, counted, bagged, barcode-labelled and then dried for three days in an oven at 37° C. The panicles were then threshed and all the seeds were collected and counted.
- the filled husks were separated from the empty ones using an air-blowing device. The empty husks were discarded and the remaining fraction was counted again.
- the filled husks were weighed on an analytical balance. The number of filled seeds was determined by counting the number of filled husks that remained after the separation step. The total seed yield was measured by weighing all filled husks harvested from a plant. Total seed number per plant was measured by counting the number of husks harvested from a plant.
- Thousand Kernel Weight is extrapolated from the number of filled seeds counted and their total weight.
- the Harvest Index (HI) in the present invention is defined as the ratio between the total seed yield and the above ground area (mm 2 ), multiplied by a factor 10 6 .
- the total number of flowers per panicle as defined in the present invention is the ratio between the total number of seeds and the number of mature primary panicles.
- the seed fill rate as defined in the present invention is the proportion (expressed as a %) of the number of filled seeds over the total number of seeds (or florets).
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US20150096069A1 (en) * | 2012-04-20 | 2015-04-02 | Monsanto Technology Llc | Transgenic Plants With Enhanced Traits |
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US10662435B2 (en) * | 2014-07-03 | 2020-05-26 | Pioneer Overseas Corporation | Plants having altered agronomic characteristics under abiotic stress conditions and related constructs and methods involving genes encoding NAC3/ONAC067 polypeptides |
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Also Published As
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WO2007144190A3 (en) | 2008-04-17 |
CA2654100A1 (en) | 2007-12-21 |
AU2007260202B2 (en) | 2014-03-27 |
WO2007144190A2 (en) | 2007-12-21 |
AU2007260202A1 (en) | 2007-12-21 |
EP2599869A2 (en) | 2013-06-05 |
KR101105330B1 (ko) | 2012-01-18 |
US20160010104A1 (en) | 2016-01-14 |
MX2008016047A (es) | 2009-05-22 |
EP2032704A2 (en) | 2009-03-11 |
AR069996A1 (es) | 2010-03-10 |
EP2599869A3 (en) | 2013-09-11 |
KR20090027219A (ko) | 2009-03-16 |
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